Andrew Mountbatten-Windsor was arrested yesterday, the day he turned 66, on suspicion of misconduct in public office. Mountbatten-Windsor, a former prince, has been in the public eye for years over his friendship with the late sex offender Jeffrey Epstein. But it was following disclosures of files by the US government about his time as a special representative for UK trade that may have led to a criminal investigation.

Mountbatten-Windsor had his royal titles stripped last year. But the royal family benefits in several ways from longstanding constitutional principles that protect the monarch from prosecution. Francesca Jackson, who studies the privileges enjoyed the monarchy, answers our questions.

Sometimes you can’t help but laugh, even in the most serious of situations. Indeed sometimes knowing you’re not supposed to laugh makes it all the harder to control the giggles. Here’s what’s going on in the brain. Plus, you may not have heard of Epstein–Barr virus but you almost certainly have it. And new research is revealing how for few unlucky people this incredibly common infection may be linked to MS.