Crucially, the answer is the same for everyone each day, meaning that you're competing against the rest of the world, rather ...

Lateral-thinking puzzles fall into the latter category. Among the trickiest riddles out there, these brain games will give your noggin a serious workout. That’s because they’re not as clear-cut as ...

Differential equations are fundamental tools in physics: they are used to describe phenomena ranging from fluid dynamics to general relativity. But when these equations become stiff (i.e. they involve ...

Emily Garman told Newsweek that her 10-year-old was "trying to be a little bit funny, but she wanted to make her teacher ...