A History of Short Words

From the New York Times Crossword Puzzle

CHEM

Mon, 13 Oct '25
Sci. class in a lab
Mon, 23 Jan '23
Sci. class that might have controlled explosions
Sun, 1 Jan '23
STEM subject that rhymes with "stem"
Sat, 24 Jul '21
With 51-Down, where solutions are kept, in brief