Rapatronic photographs of test nuclear explosions in the 1950s. Each shot was taken at intervals of millionths of a second. Even milliseconds after detonation, the deadly fireball had already engulfed the blast tower. Amazing.
Update, March 2019: I updated the now-dead link here because I got a Dell SEO contractor email asking me to remove “irrelevant” old VCE.com hyperlinks, which I find hilarious.