TIL Scientists routinely run naked in -100 degree (F) temperatures. They have learned they can survive about 3 minutes, and breathe through a snorkel that heats up the air so they don't freeze their lungs.
TIL the first close up photo from Mars was taking so long to print that impatient scientists taped the raw data to the wall and colored over it with pastel crayon manually assigning color and value to the binary code.
TIL that the murdered body of a man was found 40 years later after an unusual for the area fig tree grew out of a seed in his stomach.
TIL the New Cult Awareness Network is owned and operated by the Church of Scientology after they sued the original organization out of existence in 1996.
TIL about "The Third Wave", an experiment to demonstrate to high schoolers how the citizens of Germany were susceptible to Nazi fascism. It grew to over 200 students and the teacher completely lost control over the student body.