Still feeling lazy (actually very busy), so here are some older essays I like quite a bit:
There's Plenty of Room at the Bottom, in which Richard Feynman invented the field of nanotechnology. Not exaggerating.
On Being the Right Size, in which J.B.S. Haldane ruined Honey, I Shrunk the Kids for me.
Science: The Endless Frontier, in which Vannevar Bush invented government-funded civilian research. Exaggerating.