Did You Know?
About 2,500 million people, half the world's population, use wood for cooking and heating.
Just one square centimetre of the Sun's surface shines with the brightness of 232,500 candles.
Out of all the fish caught in the world, about three quaters are eaten as food. The other quarter is used to make such things as glue, soap, margarine, pet food and fertiliser.
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