This week in science: A world record, a world first, and much more! We start with a scorpion you absolutely don't want to meet. Thankfully, you probably won't have to worry about running into this critter. After all, this scorpion lived 415 million years ago. Let's just say it's big. Scary big. This week, we've also got news about a world-first gene therapy that could reverse some symptoms of aging. Despite the considerable promise, it's worth noting that the technique comes with substantial risk.