Humans are drawn to foods with certain components - and pizza has them all.
Birds spend a lot of time and energy singing, but they don't do it the same way in every season of the year. And some can't sing at all. What's the purpose of birdsong?
You need three ingredients to make a fire. A fire extinguisher removes at least one of them.
People have probably always wanted clean and healthy teeth. What they historically used to achieve dental hygiene might surprise you.
Does homework help children learn during the school year?
It might seem like hummingbird only eat sweet foods. Their diet is actually far more complex.
We're getting closer to having the technology need to send humans to Mars. Will it happen in your lifetime?
In baseball, a pitcher can throw a ball that seems to curve away just as it crosses the plate. How do they do it? It's all about aerodynamics.
How long does it take for your eyes to adjust to the dark and how does it happen?