A battery that runs on sunshine and fresh air sounds like something from a utopian novel, along with fusion-powered hover cars and cancer-curing breakfast cereals. But that is exactly what scientists at The Ohio State University have just invented: a solar cell that stores its own power.
When light hits wet hair, some of the light reflecting off the surface of the hair strikes the inside surface of the water film at the right angle to be reflected or refracted back onto the hair again.
It is one of the greatest mysteries in science: why does the Universe consist almost entirely of matter? Answering this question is the ultimate goal of scientists who are attempting to make antimatter in the lab.
Substances generate a smell when their molecules land on so-called olfactory neurones in our noses (which, for some things, is a pretty unpleasant thought). But the exact nature of the interaction is somewhat controversial.
Strictly speaking, the Earth’s gravity will always pull on an object, no matter how distant. Gravity is a force that obeys an ‘inverse square law’. So, for example, put an object twice as far away and it will feel a quarter of the force.