On this Day in History in 1802: Heinrich Wilhelm Matthäus Olbers discovers 2 Pallas, the second asteroid known to man.
On this Day in History in 1882: German scientist Robert Koch discovers and describes the tubercle bacillus which causes tuberculosis (Mycobacterium tuberculosis).
On this Day in History in 1896: Henri Becquerel discovers radioactivity.
On this Day in History in 1773: The Whirlpool Galaxy was discovered by Charles Messier.
On this Day in History in 1848: Hyperion, moon of Saturn, discovered by Bond (US) & Lassell (England).
On this Day in History: Some group of peoples were persecuted, some Pope did something, something was discovered, politicians lied, the general populace were fucked over by some douche bag in power, and they liked it, because they have no backbone.