What did you do to celebrate Earth Day yesterday?! Project Scientist made bird feeders and put them in a local park in their community. National Geographic came out with 20 incredible shots of Earth from space to celebrate the day. Check the pictures out here. And the Huffington Post even put out a spoof on what celebrities are doing to observe the day. Take a look at what they put together if you're in need of a good chuckle.Let us know what you did to celebrate Earth Day yesterday and you'll be entered to win a free lab manual!