У You've probably seen an object like this on a station platform - but what's it for?

https://blog.railwaymuseum.org.uk/the-piece-of-plastic-that-keeps-the-rail-network-running/

Y Neanderthals died out 40,000 years ago, but there has never been more of their DNA on Earth

https://theconversation.com/neanderthals-died-out-40-000-years-ago-but-there-has-never-been-more-of-their-dna-on-earth-189021