Discover the 11 best Halloween books for children in 2025. Learn about the all-time spooky favourites like The Halloween Tree ...

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"The kid starts cackling, and I realise he invented his own question in order to trick me into saying it," the teacher wrote.

Here, Adam recalls their conversation for BBC World Service programme CrowdScience: The Silurian hypothesis proposes that if there was a technologically advanced civilisation hundreds of millions of ...