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<oerjan> learn This is something people on the channel like to talk about. We\'re often unsure what this is, though.
author HackBot
date Sat, 09 Dec 2017 11:45:07 +0000
parents 9476192dfbb9
children
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After the London terrorist attacks of 2005, the Underground was completely evacuated. Without air resistance, the trains would go at blazingly fast speeds between the terminals. This is called a vacuum tube. Sadly, current technology doesn't let passengers travel that way.