Mnemonic Device
- 5x10^9, 8, 7, 6, 5, 4, 3, 2, 1, 0
Explanation
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 century, global warming & warring