Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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Nachos were actually invented by a guy named Nacho. Happy Nacho Day!
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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Brass doorknobs automatically disinfect themselves in about 8 hours.
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In Georgia, there is an airtight room called the Crypt of Civilization that was sealed in 1940. It contains numerous artefacts documenting what life was like at the time of sealing, and is scheduled to be opened in the year 8113 to show people of the future exactly what life was like.
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