circa 2,400,000 BCE — Genus homo evolves

The earliest species to evolve in the genus homo was Homo habilis, which is believed to have evolved in Africa from Australopithecene ancestors (although which of several species of australopithecus was the direct ancestor is not known). The genus homo would go on to become the most successful species in the entire history of the earth, until it created a global ecological catasprophe in the early to mid twenty first century, which destroyed all the members of that genus, and almost every other genus above the size of bacteria.

(By the way, if you’re reading this, you’re either a homo, or an extraterrestrial intelligence that’s very tolerant of our immaturity.)

(Man, I love that pun.)