David Webb and his wife came to our clas on block day to teach about vacuums and about amostphere presseure. He did amazing things for example he made a big marshmellow by putting in this machine and blocking allthe atmostphere pressure out. Also he blew a little air in the baloon and puit in the same machine and tunred it on and the became bigger. then when he took it out it deflated. Lastly David Webb is a really nice guy.
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