Although experts often disagree, there is scientific evidence which shows that the domestication of dogs could have occurred more than 15,000 years ago.

Since 1978, at least 37 people have died as a result of shaking vending machines, in an attempt to get free merchandise. More than 100 people have been injured.

Lake Baikal is the oldest freshwater lake on Earth, having formed between 20 and 25 million years ago.

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