A rainbow on Venus is called a glory. Appearing as a series of coloured concentric rings, these are caused by the interference of light waves within droplets, rather than the reflection, refraction and dispersion of light that makes a rainbow.

You don't like the sound of your own voice because of the bones in your head. This may be because the bones in our head make our voice sound deeper.

It's almost impossible to get too much sugar from fresh fruit. While the sugar in fruit is mostly fructose and glucose (fructose is what's converted into fat in your body), you can't get too much sugar from fresh fruit. Fresh fruit contains a lot of fibre and water which slows down your digestion and makes you feel full.

Martial artists who smile before the start of a match are more likely to lose. This could be as a smile can convey fear or submissiveness.

LEGO bricks withstand compression better than concrete. An ordinary plastic LEGO brick is able to support the weight of 375,000 other bricks before it fails. This, theoretically, would let you build a tower nearing 3.5km in height. Scaling this up to house-size bricks, however, would cost far too much.

Platypuses sweat milk. This is because it doesn't have teats. Milk appears as sweat on a platypus, but it's an aquatic mammal so it doesn't actually sweat at all.

Being bored is actually a 'high arousal state' physiologically. This is because when you're bored your heart rate increases.