You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
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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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The full moon causes a tidal wave to roll up the Amazon river once in day and once in night for a period of only three weeks in a year. This results in continuous 4m high wave that can be surfed for up to 13km.
14
Cuban rescue workers use sniffer rabbits to find people in collapsed buildings.
10
Passengers on the Beijing subway can pay with plastic bottles.
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