if( aicp_can_see_ads() ) { $adCode = '
'; return $adCode; } else { return '
'; }

Four ways to understand the Earth’s age

The Earth is 4.6 billion years old — but how can humans relate to a number so colossal, and where do we fit on the geologic timeline? Comparing the Earth’s lifetime to one calendar year, events like the extinction of dinosaurs and Columbus setting sail took place relatively recently. Joshua M. Sneideman reminds us of our time and place in the universe.


Lesson by Joshua M. Sneideman, animation by Powerhouse Animation Studios Inc.