The year 1984 in science and technology involved some significant events.
Astronomy and space exploration
* February 7 –
Astronaut
An astronaut (from the Ancient Greek (), meaning 'star', and (), meaning 'sailor') is a person trained, equipped, and deployed by a human spaceflight program to serve as a commander or crew member aboard a spacecraft. Although generally r ...
s
Bruce McCandless II
Bruce McCandless II (born Byron Willis McCandless; June 8, 1937 – December 21, 2017) was a United States Navy officer and aviator, electrical engineer, and NASA astronaut. In 1984, during the first of his two Space Shuttle missions, he c ...
and
Robert L. Stewart
Robert Lee Stewart (born August 13, 1942) is a retired brigadier general of the United States Army and a former NASA astronaut.
Personal
Stewart was born August 13, 1942, in Washington, D.C. He graduated from Hattiesburg High School in Hatt ...
make the first untethered
space walk
Extravehicular activity (EVA) is any activity done by an astronaut in outer space outside a spacecraft. In the absence of a breathable Earthlike atmosphere, the astronaut is completely reliant on a space suit for environmental support. EVA inc ...
.
* The
National Radio Astronomy Observatory
The National Radio Astronomy Observatory (NRAO) is a federally funded research and development center of the United States National Science Foundation operated under cooperative agreement by Associated Universities, Inc. for the purpose of radio ...
in the
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five ma ...
converts the 36-foot
radio telescope on
Kitt Peak (originally built in
1967
Events
January
* January 1 – Canada begins a year-long celebration of the 100th anniversary of Canadian Confederation, Confederation, featuring the Expo 67 World's Fair.
* January 5
** Spain and Romania sign an agreement in Paris, establ ...
) to the
ARO 12m Radio Telescope
The ARO 12m Radio Telescope (ARO12m or KP12m) is a 12-meter dish located on Kitt Peak, approximately from Tucson in Arizona at an elevation of .
History
The original dish was built in 1967 under the umbrella of the National Radio Astronomy ...
.
Biology
* First known case of
Bovine spongiform encephalopathy
Bovine spongiform encephalopathy (BSE), commonly known as mad cow disease, is an incurable and invariably fatal neurodegenerative disease of cattle. Symptoms include abnormal behavior, trouble walking, and weight loss. Later in the course of ...
, in
England
England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe ...
.
* The
enzyme
Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrate (chemistry), substrates, and the enzyme converts the substrates into different molecule ...
telomerase
Telomerase, also called terminal transferase, is a ribonucleoprotein that adds a species-dependent telomere repeat sequence to the 3' end of telomeres. A telomere is a region of repetitive sequences at each end of the chromosomes of most e ...
is discovered by
Carol W. Greider
Carolyn Widney Greider (born April 15, 1961) is an American molecular biologist and Nobel laureate. She joined the University of California, Santa Cruz as a Distinguished Professor in the department of molecular, cell, and developmental biology ...
and
Elizabeth Blackburn
Elizabeth Helen Blackburn, (born 26 November 1948) is an Australian-American Nobel laureate who is the former president of the Salk Institute for Biological Studies. Previously she was a biological researcher at the University of California, ...
in the ciliate ''
Tetrahymena
''Tetrahymena'', a unicellular eukaryote, is a genus of free-living ciliates. The genus Tetrahymena is the most widely studied member of its phylum. It can produce, store and react with different types of hormones. Tetrahymena cells can recogn ...
''.
* Danish physiologist
Steen Willadsen
Steen Malte Willadsen (born 1943 in Copenhagen, Denmark) is a Danish biologist credited with being the first to clone a mammal using nuclear transfer.
Willadsen graduated from the Royal Veterinary College of Copenhagen (1969), and received a Ph ...
first successfully uses cells from early embryos to clone a mammal (sheep) by nuclear transfer at the British
Agricultural Research Council
The Agricultural and Food Research Council (AFRC) was a British Research Council responsible for funding and managing scientific and technological developments in farming and horticulture.
History
The AFRC was formed in 1983 from its predecessor ...
's Institute of Animal Physiology, Cambridge.
Chemistry and physics
*
Peter Kramer and
Dan Shechtman
Dan Shechtman ( he, דן שכטמן; born January 24, 1941)[Dan Shechtman](_blank)
. (PDF). Retri ...
publish their discoveries of what will soon afterwards be named
quasicrystal
A quasiperiodic crystal, or quasicrystal, is a structure that is ordered but not periodic. A quasicrystalline pattern can continuously fill all available space, but it lacks translational symmetry. While crystals, according to the classical ...
s.
* Hiroshi Kobayashi and colleagues announce synthesis of
tetrakis(3,5-bis(trifluoromethyl)phenyl)borate
Tetrakis ,5-bis(trifluoromethyl)phenylorate is an anion with chemical formula B��, which is commonly abbreviated as ArF4
ADP-ribosylation factor 4 is a protein that in humans is encoded by the ''ARF4'' gene.
Function
ADP-ribosylation factor 4 (ARF4) is a member of the human ARF gene family. These genes encode small guanine nucleotide-binding proteins that stimul ...
��, indicating the presence of fluorinated aryl (ArF) groups. It is sometimes referred to as ''Kobayashi's anion'' ...
("BARF").
Computer science
* January 24 –
Apple Computer
Apple Inc. is an American multinational technology company headquartered in Cupertino, California, United States. Apple is the largest technology company by revenue (totaling in 2021) and, as of June 2022, is the world's biggest company ...
places the
Macintosh
The Mac (known as Macintosh until 1999) is a family of personal computers designed and marketed by Apple Inc. Macs are known for their ease of use and minimalist designs, and are popular among students, creative professionals, and software en ...
personal computer
A personal computer (PC) is a multi-purpose microcomputer whose size, capabilities, and price make it feasible for individual use. Personal computers are intended to be operated directly by an end user, rather than by a computer expert or tech ...
on sale in the United States. It will be the first successful PC to use a
graphical user interface
The GUI ( "UI" by itself is still usually pronounced . or ), graphical user interface, is a form of user interface that allows User (computing), users to Human–computer interaction, interact with electronic devices through graphical icon (comp ...
.
* June 6 – The ''
Tetris
''Tetris'' (russian: link=no, Тетрис) is a puzzle video game created by Soviet Union, Soviet software engineer Alexey Pajitnov in 1984. It has been published by several companies for multiple platforms, most prominently during a dispute o ...
''
tile-matching video game
A tile-matching video game is a type of puzzle video game where the player manipulates tiles in order to make them disappear according to a matching criterion. In many tile-matching games, that criterion is to place a given number of tiles of the ...
, designed by
Alexey Pajitnov
Alexey Leonidovich Pajitnov. (born 16 April 1955) is a Russian-born American computer engineer and video game designer. He is best-known for designing and developing ''Tetris'' in 1984 while working at the Dorodnitsyn Computing Centre under the ...
, is launched in the Soviet Union.
*The first edition of language documentation ''
Common Lisp the Language
''Common Lisp the Language'' is a reference book by Guy L. Steele about a set of technical standards and programming languages named Common Lisp.
History Before standardizing
The first edition (Digital Press, 1984; ; 465 pages) was written by Guy ...
'' (known as CLtL1) is published in the United States.
History of science
*
Robert Gwyn Macfarlane
Robert Gwyn Macfarlane (26 June 1907 – 26 March 1987) was an English hematologist.
Life
Born in Worthing, Sussex, Gwyn Macfarlane left Cheltenham College in 1924 and a year later entered the Medical School of St Bartholomew's Hospital, L ...
publishes ''Alexander Fleming: The Man and the Myth''.
Paleontology
* The fossil skeleton of the
hominid
The Hominidae (), whose members are known as the great apes or hominids (), are a taxonomic family of primates that includes eight extant species in four genera: '' Pongo'' (the Bornean, Sumatran and Tapanuli orangutan); ''Gorilla'' (the e ...
"
Turkana Boy
Turkana Boy, also called Nariokotome Boy, is the name given to fossil KNM-WT 15000, a nearly complete skeleton of a ''Homo ergaster'' youth who lived 1.5 to 1.6 million years ago. This specimen is the most complete early hominin skeleton ever ...
" is discovered in
Kenya
)
, national_anthem = " Ee Mungu Nguvu Yetu"()
, image_map =
, map_caption =
, image_map2 =
, capital = Nairobi
, coordinates =
, largest_city = Nairobi
, ...
.
Physiology and medicine
* February 3 – Dr.
John Buster
John Edmond Buster (born July 18, 1941) is an American physician who, while working at the University of California at Los Angeles School of Medicine, directed the research team that performed the first embryo transfer from one woman to another ...
and the research team at
Harbor-UCLA Medical Center announce history's first
embryo transfer
Embryo transfer refers to a step in the process of assisted reproduction in which embryos are placed into the uterus of a female with the intent to establish a pregnancy. This technique (which is often used in connection with in vitro fertilizat ...
from one woman to another resulting in a live birth.
* April 22 – Dr.
Robert Gallo
Robert Charles Gallo (; born March 23, 1937) is an American biomedical researcher. He is best known for his role in establishing the human immunodeficiency virus (HIV) as the infectious agent responsible for acquired immune deficiency syndrome ( ...
and
Margaret Heckler
Margaret Mary Heckler (née O'Shaughnessy; June 21, 1931 – August 6, 2018) was an American politician and diplomat who represented in the United States House of Representatives from 1967 until 1983. A member of the Republican Party, she al ...
of
United States Public Health Service
The United States Public Health Service (USPHS or PHS) is a collection of agencies of the Department of Health and Human Services concerned with public health, containing nine out of the department's twelve operating divisions. The Assistant ...
announce the discovery of
HTLV-III as the virus that causes
AIDS.
* May 10 –
Barbara H. Bowman and
Oliver Smithies
Oliver Smithies (23 June 1925 – 10 January 2017) was a British-American geneticist and physical biochemist. He is known for introducing starch as a medium for gel electrophoresis in 1955, and for the discovery, simultaneously with Mario Capec ...
show that variations in
haptoglobin
Haptoglobin (abbreviated as Hp) is the protein that in humans is encoded by the ''HP'' gene. In blood plasma, haptoglobin binds with high affinity to ''free'' hemoglobin released from erythrocytes, and thereby inhibits its deleterious oxidativ ...
s are due to
genetic polymorphism
A gene is said to be polymorphic if more than one allele occupies that gene's locus within a population. In addition to having more than one allele at a specific locus, each allele must also occur in the population at a rate of at least 1% to ge ...
s.
Technology
* May 5 –
Itaipu Dam
The Itaipu Dam ( pt, Barragem de Itaipu , es, Represa de Itaipú ) is a hydroelectric dam on the Paraná River located on the border between Brazil and Paraguay. The construction of the dam was first contested by Argentina, but the negotiations ...
in South America begins to generate
hydroelectricity
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined a ...
.
* July 21 – In
Jackson
Jackson may refer to:
People and fictional characters
* Jackson (name), including a list of people and fictional characters with the surname or given name
Places
Australia
* Jackson, Queensland, a town in the Maranoa Region
* Jackson North, Qu ...
, Michigan, a factory
robot
A robot is a machine—especially one programmable by a computer—capable of carrying out a complex series of actions automatically. A robot can be guided by an external control device, or the control may be embedded within. Robots may be ...
crushes a worker against a safety bar in apparently the first robot-related death in the United States.
Awards
*
Nobel Prize
The Nobel Prizes ( ; sv, Nobelpriset ; no, Nobelprisen ) are five separate prizes that, according to Alfred Nobel's will of 1895, are awarded to "those who, during the preceding year, have conferred the greatest benefit to humankind." Alfre ...
s
**
Physics
Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge which rel ...
–
Carlo Rubbia
Carlo Rubbia (born 31 March 1934) is an Italian particle physicist and inventor who shared the Nobel Prize in Physics in 1984 with Simon van der Meer for work leading to the discovery of the W and Z particles at CERN.
Early life and educat ...
,
Simon van der Meer
Simon van der Meer (24 November 19254 March 2011) was a Dutch particle accelerator physicist who shared the Nobel Prize in Physics in 1984 with Carlo Rubbia for contributions to the CERN project which led to the discovery of the W and Z part ...
**
Chemistry –
Robert Bruce Merrifield
Robert Bruce Merrifield (July 15, 1921 – May 14, 2006) was an American biochemist who won the Nobel Prize in Chemistry in 1984 for the invention of solid phase peptide synthesis.
Early life
He was born in Fort Worth, Texas, on 15 July 1921, ...
**
Medicine
Medicine is the science and Praxis (process), practice of caring for a patient, managing the diagnosis, prognosis, Preventive medicine, prevention, therapy, treatment, Palliative care, palliation of their injury or disease, and Health promotion ...
–
Niels K. Jerne
Niels Kaj Jerne, FRS (23 December 1911 – 7 October 1994) was a Danish immunologist. He shared the Nobel Prize in Physiology or Medicine in 1984 with Georges J. F. Köhler and César Milstein "for theories concerning the specificity in devel ...
,
Georges J. F. Köhler
Georges Jean Franz Köhler (; 17 April 1946 – 1 March 1995) was a German biologist.
Together with César Milstein and Niels Kaj Jerne, Köhler won the Nobel Prize in Physiology or Medicine in 1984, "for work on the immune system and the prod ...
,
César Milstein
César Milstein, CH, FRS (8 October 1927 – 24 March 2002) was an Argentine biochemist in the field of antibody research. Milstein shared the Nobel Prize in Physiology or Medicine in 1984 with Niels Kaj Jerne and Georges J. F. Köhler for d ...
*
Turing Award
The ACM A. M. Turing Award is an annual prize given by the Association for Computing Machinery (ACM) for contributions of lasting and major technical importance to computer science. It is generally recognized as the highest distinction in compu ...
–
Niklaus Wirth
Niklaus Emil Wirth (born 15 February 1934) is a Swiss computer scientist. He has designed several programming languages, including Pascal, and pioneered several classic topics in software engineering. In 1984, he won the Turing Award, generally ...
Births
* May 14 –
Mark Zuckerberg
Mark Elliot Zuckerberg (; born ) is an American business magnate, internet entrepreneur, and philanthropist. He is known for co-founding the social media website Facebook and its parent company Meta Platforms (formerly Facebook, Inc.), of ...
,
American
American(s) may refer to:
* American, something of, from, or related to the United States of America, commonly known as the " United States" or "America"
** Americans, citizens and nationals of the United States of America
** American ancestry, ...
computer programmer
A computer programmer, sometimes referred to as a software developer, a software engineer, a programmer or a coder, is a person who creates computer programs — often for larger computer software.
A programmer is someone who writes/creates ...
and
entrepreneur
Entrepreneurship is the creation or extraction of economic value. With this definition, entrepreneurship is viewed as change, generally entailing risk beyond what is normally encountered in starting a business, which may include other values t ...
, co-founder of
social media
Social media are interactive media technologies that facilitate the creation and sharing of information, ideas, interests, and other forms of expression through virtual communities and networks. While challenges to the definition of ''social me ...
platform
Facebook
Facebook is an online social media and social networking service owned by American company Meta Platforms. Founded in 2004 by Mark Zuckerberg with fellow Harvard College students and roommates Eduardo Saverin, Andrew McCollum, Dustin ...
* December 2 –
Maryna Viazovska
Maryna Sergiivna Viazovska ( uk, Марина Сергіївна Вязовська, ; born 2 December 1984) is a Ukrainian mathematician known for her work in sphere packing. She is full professor and Chair of Number Theory at the Institute of M ...
, Ukrainian-born mathematician
Deaths
* January 8 –
Eerik Kumari
Eerik Kumari born Erik Mathias Sits (7 March 1912 – 8 January 1984) was a biologist, and pioneer of ornithology and nature conservation in Estonia. He was born in Kirbla, Lihula Parish. He was a director of the Institute of Zoology and Bota ...
(b.
1912
Events January
* January 1 – The Republic of China is established.
* January 5 – The Prague Conference (6th All-Russian Conference of the Russian Social Democratic Labour Party) opens.
* January 6
** German geophysicist Alfred ...
), Estonian ornithologist and academic
* February 21 –
Anna Baetjer
Anna Medora Baetjer (July 7, 1899 – February 21, 1984) was an American physiologist and toxicologist, known for her research into the health effects of industrial work on women and for her discovery of the carcinogenic properties of chromium.
...
(b.
1899
Events January 1899
* January 1
** Spanish rule ends in Cuba, concluding 400 years of the Spanish Empire in the Americas.
** Queens and Staten Island become administratively part of New York City.
* January 2 –
**Bolivia sets up a ...
),
American
American(s) may refer to:
* American, something of, from, or related to the United States of America, commonly known as the " United States" or "America"
** Americans, citizens and nationals of the United States of America
** American ancestry, ...
toxicologist
Toxicology is a scientific discipline, overlapping with biology, chemistry, pharmacology, and medicine, that involves the study of the adverse effects of chemical substances on living organisms and the practice of diagnosing and treating ex ...
.
* April 8 –
Pyotr Kapitsa
Pyotr Leonidovich Kapitsa or Peter Kapitza ( Russian: Пётр Леонидович Капица, Romanian: Petre Capița ( – 8 April 1984) was a leading Soviet physicist and Nobel laureate, best known for his work in low-temperature physic ...
(b.
1894
Events January–March
* January 4 – A military alliance is established between the French Third Republic and the Russian Empire.
* January 7 – William Kennedy Dickson receives a patent for motion picture film in the United S ...
),
Russian
Russian(s) refers to anything related to Russia, including:
*Russians (, ''russkiye''), an ethnic group of the East Slavic peoples, primarily living in Russia and neighboring countries
*Rossiyane (), Russian language term for all citizens and peo ...
physicist,
Nobel Prize
The Nobel Prizes ( ; sv, Nobelpriset ; no, Nobelprisen ) are five separate prizes that, according to Alfred Nobel's will of 1895, are awarded to "those who, during the preceding year, have conferred the greatest benefit to humankind." Alfre ...
laureate.
* April 15 –
Grete Hermann
Grete Hermann (2 March 1901 – 15 April 1984) was a German mathematician and philosopher noted for her work in mathematics, physics, philosophy and education. She is noted for her early philosophical work on the foundations of quantum mechanics, ...
(b.
1901
Events
January
* January 1 – The British colonies of New South Wales, Queensland, South Australia, Tasmania, Victoria and Western Australia federate as the Commonwealth of Australia; Edmund Barton becomes the first Prime Min ...
),
German
German(s) may refer to:
* Germany (of or related to)
**Germania (historical use)
* Germans, citizens of Germany, people of German ancestry, or native speakers of the German language
** For citizens of Germany, see also German nationality law
**Ger ...
mathematician and philosopher
* May 13 –
Stanislaw Ulam
Stanisław Marcin Ulam (; 13 April 1909 – 13 May 1984) was a Polish-American scientist in the fields of mathematics and nuclear physics. He participated in the Manhattan Project, originated the Teller–Ulam design of thermonuclear weapo ...
(b.
1909
Events
January–February
* January 4 – Explorer Aeneas Mackintosh of the Imperial Trans-Antarctic Expedition escaped death by fleeing across ice floes.
* January 7 – Colombia recognizes the independence of Panama.
* J ...
),
Polish American
Polish Americans ( pl, Polonia amerykańska) are Americans who either have total or partial Polish ancestry, or are citizens of the Republic of Poland. There are an estimated 9.15 million self-identified Polish Americans, representing about 2.8 ...
mathematician
A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems.
Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...
.
* May 24 – Sir
Stanley Hooker
Sir Stanley George Hooker, CBE, FRS, DPhil, BSc, FRAeS, MIMechE, FAAAS, (30 September 1907 – 24 May 1984) was a mathematician and jet engine engineer. He was employed first at Rolls-Royce where he worked on the earliest designs such as ...
(b.
1907
Events
January
* January 14 – 1907 Kingston earthquake: A 6.5 Moment magnitude scale, Mw earthquake in Kingston, Jamaica, kills between 800 and 1,000.
February
* February 11 – The French warship French cruiser Jean Bart ( ...
),
English
English usually refers to:
* English language
* English people
English may also refer to:
Peoples, culture, and language
* ''English'', an adjective for something of, from, or related to England
** English national id ...
aeronautical engineer
Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches: aeronautical engineering and astronautical engineering. Avionics engineering is si ...
.
* August 6 –
Abraham Lilienfeld
Abraham Morris Lilienfeld (November 13, 1920 – August 6, 1984) was an American epidemiologist and professor at the Johns Hopkins School of Hygiene and Public Health. He is known for his work in expanding epidemiology to focus on chronic diseas ...
(b.
1920
Events January
* January 1
** Polish–Soviet War in 1920: The Russian Red Army increases its troops along the Polish border from 4 divisions to 20.
** Kauniainen, completely surrounded by the city of Espoo, secedes from Espoo as its own m ...
), American
epidemiologist
Epidemiology is the study and analysis of the distribution (who, when, and where), patterns and determinants of health and disease conditions in a defined population.
It is a cornerstone of public health, and shapes policy decisions and evidenc ...
.
* August 11 –
George Streisinger
George Streisinger (December 27, 1927 – August 11, 1984) was an American molecular biologist and co-founder of the Institute of Molecular Biology at the University of Oregon. He was the first person to clone a vertebrate, cloning zebrafish in hi ...
(b.
1927
Events January
* January 1 – The British Broadcasting ''Company'' becomes the British Broadcasting ''Corporation'', when its Royal Charter of incorporation takes effect. John Reith becomes the first Director-General.
* January 7
* ...
),
Hungarian American
Hungarian Americans ( Hungarian: ''amerikai magyarok'') are Americans of Hungarian descent. The U.S. Census Bureau has estimated that there are approximately 1.396 million Americans of Hungarian descent as of 2018. The total number of people wit ...
molecular biologist, the first person to
clone
Clone or Clones or Cloning or Cloned or The Clone may refer to:
Places
* Clones, County Fermanagh
* Clones, County Monaghan, a town in Ireland
Biology
* Clone (B-cell), a lymphocyte clone, the massive presence of which may indicate a pathologi ...
a vertebrate.
* October 20 –
Paul Dirac
Paul Adrien Maurice Dirac (; 8 August 1902 – 20 October 1984) was an English theoretical physicist who is regarded as one of the most significant physicists of the 20th century. He was the Lucasian Professor of Mathematics at the Unive ...
(b.
1902
Events
January
* January 1
** The Nurses Registration Act 1901 comes into effect in New Zealand, making it the first country in the world to require state registration of nurses. On January 10, Ellen Dougherty becomes the world's ...
), English-born
physicist
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe.
Physicists generally are interested in the root or ultimate ca ...
.
* November 20 –
Charles C. Conley
Charles Cameron Conley (26 September 1933 – 20 November 1984) was an American mathematician who worked on dynamical systems.
The Conley index theory and the Conley–Zehnder theorem are named after him.
Early life and education
Conley was bo ...
(b.
1933
Events
January
* January 11 – Sir Charles Kingsford Smith makes the first commercial flight between Australia and New Zealand.
* January 17 – The United States Congress votes in favour of Philippines independence, against the wis ...
), American mathematician working on
dynamical system
In mathematics, a dynamical system is a system in which a function describes the time dependence of a point in an ambient space. Examples include the mathematical models that describe the swinging of a clock pendulum, the flow of water i ...
s.
* December 20 –
Stanley Milgram
Stanley Milgram (August 15, 1933 – December 20, 1984) was an American social psychologist, best known for his controversial experiments on obedience conducted in the 1960s during his professorship at Yale.Blass, T. (2004). ''The Man Who Shocke ...
(b. 1933), American
social psychologist
Social psychology is the scientific study of how thoughts, feelings, and behaviors are influenced by the real or imagined presence of other people or by social norms. Social psychologists typically explain human behavior as a result of the rela ...
.
References
{{reflist
20th century in science
1980s in science