This is a straightforward vocabulary test, so if you've ever taken the SATs, this will feel totally familiar. Take the quiz here. It's highly unlikely you'll ever need to write something without spell ...

IQ tests challenge your intelligence and the ability to observe minute details. You will be among the top 1% of readers if ...

From twinkling constellations to stellar life cycles, this starry skywatching quiz will test your cosmic knowledge.

New research complicates the old consensus that IQ is largely fixed, and that's good news for anyone looking to boost their ...