The heart is a pump, and the blood goes round, and round, and round all the time. And why does it do that? Why can't it just have a rest? Well, the blood has to be kept moving around all the time ...

Many designs involve multiple engineering domains. For example, hybrid vehicles balance engine performance with emissions limits; UAVs balance thermal limitations on their batteries with ...

Narrator: Blood gets around our bodies through a system of blood vessels. To picture the blood vessels, imagine a busy network of roads. And those roads are always full of little vans which are busy ...