Theodosius Dobzhansky
Discovery : Modern Synthesis

Theory Bohr
Discovery : Electron

Theory Ernst Mayr
Discovery : Evolutionary

Theory Maxwell
Discovery : Electromagnetic

Thomas Hunt Morgan
Discovery : Theory Of Heredity Chromosomal

Thomas Alva Edison
Discoveries : Cinematograph, Cinematography, Electric Lamp, Gramophone, Movie Projector

Thomas Newcome
Discovery : Steam Engine (Piston)

Thomas Saint
Discovery : Sewing Machine

Tim Berners Lee
Discovery : World Wide Web And Hypertext Markup Language

Trofim Lysenko
Discovery : Soviet Genetics

Tycho Brahe
Discovery : New Astronomy

T.N.T. : llly Brandt
Talkies : Lee-de-Frost
Tank : Sir Ernest Swington
Telegraph : Samuel Morse
Telegraphic Code : Samuel Morse
Telephone : Sir Alexander Graham Bell
Telescope : Galileo
Television (mechanical) : John Logie Baird
Television : Baird
Tempo of Evolution : George Gaylord Simpson
Terylene : J. Whinfield and H. Dickson
The long playing microgroove record : Peter Goldmark
Theory of conditioned reflex : Pavlov
Theory of Evolution : Darwin
Theory of Relativity : Einstein
Theory of the Atom : John Dalton
Thermodynamics : Ludwig Boltzmann
Thermometer : Galileo Gallei
Thermos Flasks : Dewar
Tractor : J. Froelich
Transformer : Michael Faraday
Transistor : Bardeen, Shockley, Brattain
Typewriter : C. Sholes