FACT As a child, Frank Oppenheimer discovered his own sperm using a microscope. He later called it "most wonderful scientific discovery that I ever made".
FACT J. Robert Oppenheimer accused his little brother of being "slow" because it took Frank a bit longer than average to finish up his Ph.D. The real reason for the delay: Frank had joined the Communist Party and was absorbed in Great Depression-era political and social justice work.
FACT After getting blackballed out of academia during the Red Scare in the late 1940s, Frank bought a cattle ranch in rural Colorado and became a high school science teacher. There, he taught kids about thermodynamics via trips to the city dump to scavenge machine parts, and augmented a lesson on the biology of the ear by killing and dissecting a kitten. His experiences teaching science to kids later led him to found The Exploratorium.
FACT Thanks to The Exploratorium website, I now know that there is a very fine line between making something cuter, and making it hellishly creepy. Thanks, Dr. Oppenheimer!
There's more at the Guardian Science Blog: Frank Oppenheimer
Image of Frank Oppenheimer courtesy The Exploratorium, used via CC