Vacuum freezing air!

"What if...." is a great question for scientists to ask.

And I say a cracking – literally – example of this this week. If, like me, you've ever wondered what happen if you put liquid nitrogen in a vacuum then you will simply love the video below. Before you watch it, have a think about what you expect to happen in the video (ignore of this post).

Liquid nitrogen – cold and weird. Vacuum – empty and weird. Combining the two make a great recipe! And what makes this 'what if' question so great is the counter intuitive answer.

What are your 'what if' questions? Got any good videos to share? Tweet them to @Musings Pod.