It's 4am, and the big test is in 8 hours. You've been studying for days, but you still don't feel ready. Should you drink another cup of coffee and spend the next few hours cramming? Or should you go to sleep? Shai Marcu defends the latter option, showing how sleep restructures your brain in a way that's crucial for how our memory works.

Mark Shaw demos Ultra-Ever Dry, a liquid-repellent coating that acts as an astonishingly powerful shield against water and water-based materials. At the nano level, the spray covers a surface with an umbrella of air so that water bounces right off. Watch for an exciting two-minute kicker.

It’s 4 am, and the big test is in eight hours. You’ve been studying for days, but you still don’t feel ready. Should you drink another cup of coffee and spend the next few hours cramming? Or should you go to sleep? Shai Marcu defends the latter option, showing how sleep restructures your brain in a way that’s crucial for how our memory works. ...

We often look at people with differing abilities (a term we prefer over 'disabilities') and focus on what society needs to do for them. John and Mark X. Cronin, a father-son business team, show that we have the question backwards. We should be asking how people with differing abilities can help us. John, who has Down Syndrome, and his father Mar...