Billions of neutrinos pass unnoticed through your body every second.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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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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