Brush your teeth before downing a glass of orange juice, and you're gonna have a bad time. But why?

We've all experienced a sleepless night or two, and for some people that's actually the norm. But why do we experience insomnia at all? What is going on in our minds and bodies, to cause this awful condition? Here's what scientists know so far.

Between fevers, congestion and diarrhea, there are numerous ways that microbes can make us feel sick. But just how do microorganisms cause these symptoms?

There's a reason we only ever see one side of the Moon. It's tidally locked to the Earth, presenting only one side to us as it orbits around the planet. Tidal locking is a fate that befalls lots of planetary bodies, and it can wreak havoc on the surface.

"Imagine a world designed by Kafka, Stalin, Orwell, Huxley, Sartre and the Marx Brothers..."

Some of you have seen a toy popping up in the Halloween decorations aisle of most of the stores that you've visited. It's called "My Pet Ghost." It recycles an old stage trick and puts it in a bottle. We'll show you how a ghost appears and disappears inside a jug.

If everything from technology to politics will be different in the future, then so will human reproduction. That's why so much science fiction deals with the question of how humans make babies — or don't make them — in alternate worlds that are often quite close to our own. It's also why reproduction is a political…

The nuclear disaster in Japan has left many people in danger of exposure to radiation and radioactivity. Some are simply fearful. What exactly is this radiation? And what threat does it pose? We've got some answers below.