Brainwash: What are dark sky preserves?

Where is sodium chloride used? What makes calico cats unique? How does thunder form? A scientific trivia quiz

Ettay Nevo/Davidson Institute for Science Education|
The commenter agrees to the privacy policy of Ynet News and agrees not to submit comments that violate the terms of use, including incitement, libel and expressions that exceed the accepted norms of freedom of speech.