Humans are Just a Tiny Part of Earth's Long History  
Our planet Earth formed 4.5 billion years ago. That's a really, really long time ago! Humans like us have only been around for 30,000 years. That's just a small part of the Earth's past.

It's hard to picture the Earth's long history. Here's one way to do it. Imagine the entire history of the Earth squeezed into just twelve hours, from noon to midnight.

When we think of time in this way, humans have only been around three seconds!

4.5 billion years ago the earth formed. 240 million years ago the first dinosaurs appeared. 30,000 years ago modern humans appeared.