5x10^9 (about 5 billion years ago)
the birth of the earth
5x10^8 - the first fish
5x10^7 - the first monkeys
5x10^6 - the first humans
5x10^5 - the first babies with brains
getting much bigger after birth
5x10^4 - the first language
5x10^3 - the first writing, the first
cities, the first armies
5x10^2 - the first printed books, the
hemispheres merge
5x10^1 - the first commercial computers,
everything escalates
5x10^0 - the first 5 years of the 21st C
global warming & warring