Yes, we're going into Tenet spoiler territory – avert your eyes now if you haven't seen Nolan's latest When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Tenet is enough of a puzzle itself to work out on its own, but it also has a link to an ancient, unsolved conundrum if you want to melt your brain a bit further. Christopher Nolan's epic sci-fi has ...