There was this guest presenter named David Webb who came on Tuesday to show us some really cool demos using air pressure. He had this vacuum chamber which used a pump to pump out air using air pressure (not sucking!) and really funny things would happen to things inside the airless chamber (vacuum)!
He did lots of fun stuff like putting a feather and a metal washer into the vacuum and showing us how they fell at the same time in it (because the feather doesn't encounter wind resistance). Then he magically made marshmallows bigger, like this!
It was pretty fun that day. Although I have to wonder what the American Vacuum Society is o_o.
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