new icn messageflickr-free-ic3d pan white
Have you ever wondered? | by Pedro Moura Pinheiro
Back to photostream

Have you ever wondered?

Why is there a little hole on the bottom of the mid pane of airplane windows? This is why. I also love the wonderful shapes of the ice crystals.

11,198 views
40 faves
5 comments
Taken on November 5, 2013