The year 1925 in science and technology included many events, some of which are listed here.

Biology

• July 21 - Scopes Trial: In Dayton, Tennessee, high school biology teacher John T. Scopes is found guilty of teaching evolution in class and fined $100.

Technology

• June 13 - Charles Francis Jenkins achieves the first synchronized transmission of pictures and sound, using 48 lines, and a mechanical system. A 10-minute film of a miniature windmill in motion is sent across 5 miles from Anacostia to Washington, DC. The images were viewed by representatives of the Bureau of Standards, the U.S. Navy, the Commerce Department, and others. Jenkins called this "the first public demonstration of radiovision"

Awards

• Nobel Prizes
  • Physics - James Franck, Gustav Ludwig Hertz
  • Chemistry - Richard Adolf Zsigmondy

Births

October 31 - John Pople (d. 2004), British Nobel prize winning Chemist.

Deaths

• February 3 - Oliver Heaviside (b. 1850), physicist.
• June 22 - Felix Klein (b. 1849), German mathematician.
• July 26 - Gottlob Frege (b. 1848), mathematician.