* Astronomy

 Humans killed off Australia's giant beasts

Humans hunted Australia's giant vertebrates to extinction about 40,000 years ago, the latest research published in Science has concluded.
The cause of the widespread extinction has provoked much debate, with climate change being one theory.
However, scientists studied dung samples from 130,000 and 41,000 years ago, when humans arrived, and concluded hunting and fire were the cause.
The extinction in turn caused major ecological changes to the landscape.
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