Aliens have invaded the news again. Last month, two US presidents weighed in on the topic in rapid succession, managing to make a public that was already obsessed with extraterrestrials even more so.

Before collecting any fragments of alien spaceships, you must complete a routine safety assessment – according to the UFO Field Investigator’s Manual. The book reads: ‘Check the area for strong smells ...

There was a time in the not-too-distant past when you’d only encounter images of the president hanging with aliens at the checkout counter, tucked between Harlequin romance novels and issues of TV ...