pressure experiments:jumping egg

PhysMix student blows on an egg and causes it to 'jump' up. Can you name the principle which explains this behaviour of the egg? Why does the egg 'jump' up? Can you relate this to why the roofs of houses may "lift off" during a hurricane?

pressure experiments:egg in the bottle

PhysMix students all science. Was the egg sucked into the bottle? was the egg pushed into the bottle? How do you think the egg ended up in the bottle? Try to explain!

What is 25/5? Answer= 14 !!! Click on the link to see the proof!! Challenge:Can you reproduce this crazy proof with two other numbers?
http://www.youtube.com/watch?v=cydcnQf0usg