You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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Jaguars frequently get high by eating hallucinogenic roots, which also increases their senses for hunting.
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Gorillas can catch human colds and other illnesses.
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In Mexico, artists can pay their taxes using artwork that they create.
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After coming across a "very sweet" homeless man from Jamaica named Michael on a night out, Londoner Jenny Baker took to Twitter, and within hours, using the hashtag #getmichaelhome, had raised thousands of pounds so that he could return home to Jamaica where he said he would be "happy again".
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