Humans have wanted to fly for thousands of years. Modern jet engines allow us to fly more efficiently, at greater speeds than ever before. In this Naked Science Scrapbook, we'll find out how engineers stop the engines from melting at such high temperatures, and why you couldn't run a plane on coal...

Why does ice float in the cool summer drink of your choice? And why don't ponds and lakes freeze from the bottom up, killing all the fish? Find out with the latest Naked Science Scrapbook, where we'll see that it's all down to the weird and wonderful water molecules...

Mosquitoes can transmit deadly diseases like malaria.But could they pass on HIV if they drank from an infected person?Find out with the Naked Science Scrapbook!

Copper compounds can be blue, green, yellow, brown and black - so how does it produce so many different colours? We find out the answer to this, plus why copper's flame test is green...

What's actually going on in a lightbulb when you switch it on? And why are energy saving bulbs more efficient than normal incandescent ones? Find out in the latest Naked Science Scrapbook.

We all know chameleons can change their colour at will, but how do they do it? And is it really because of camouflage?

Why is a storm cloud flattened on top? In this episode of the Naked Science Scrapbook, we'll find out what causes cumulonimbus clouds to form characteristic anvil shapes...

What makes a cake rise? In this episode of the Naked Science Scrapbook, we'll find out what ingredients cause a baking cake to go from a gloopy mass to a light fluffy sponge...

When you breathe in helium, why does your voice sound all funny? Find out in the latest Naked Science Scrapbook!

Why do you start crying after you've chopped into an onion?