Recycling fabrics, and X and Y diversity

Recycled cotton and polyester are often seen in clothing shops, but Claire tells us about the challenges to making it work, and how there are other ways to reduce waste; and Stu runs us through recent research showing much more common variations in human sex chromosomes beyond the XX and XY you might have learned at school (see more at https://doi.org/10.1016/j.gim.2022.05.011)