Scientists in the UK are creating a smartphone app that will enable users to test for STDs.
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A small airplane can fly backwards.
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A fully loaded supertanker traveling at normal speed takes a least twenty minutes to stop.
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The first alarm clock could only ring at 4 a.m.
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The normal static electricty shock that zaps your finger when you touch a doorknob is usually between 10,000 and 30,000 volts!
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The ball on top of a flagpole is called a 'truck'.
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