D.S. Deboer says "Check this out! It's neat and really helped me grasp how far away Mars is. (Hint: It's really, really, really far away.)"
(Ben shared this in the Google + Boing Boing Community. Join us there for fun link sharing and conversation!)
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects