Does light have a mass?
They're the stuff of sci-fi, but how do lasers actually work?
Is that even possible?!
And if so, how much light do we need?
How big can star systems get?
Can exposure to light change our body clock?
Can you get green stars?
When should you replace your bulbs: as they break or as soon as possible?
What's the minimum number of photons our eye can detect?
Soaps come in a variety of colours yet the bubbles are always white. Why?
Why don't you get thrown backwards when you switch on your torch? Kerstin Göpfrich found out from Dr Anna Lombardi.
We find out why petrol creates a rainbow effect when in contact with water, and how the behaviour of light can create...