In the Bemba tribe of southern Africa, if someone does something hurtful, they take the person to the center of the town where the entire tribe comes and surrounds them. For two days they tell him every good thing he has ever done, because they believe that every person comes into the world as good.
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In 2002, Kenyan Maasai tribespeople donated 14 cows to the US to help with the aftermath of 9/11.
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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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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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Cuban rescue workers use sniffer rabbits to find people in collapsed buildings.
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