200,000 years ago, anatomically modern humans in the world.
5,500 years ago, the written word begins.
475 years ago, the Scientific Revolution.
250 years ago, the Industrial Revolution.
150 years ago, the Technological Revolution.
70 years ago, digital electronic computers.
29 years ago, the Internet.
13 years ago, Smartphones & Social Media.
Another big changer due (or has already happened).
What will be the timeline in 1 billion years time? The future could be completely incomprehensible from where we are now.