Challenge Level

Make your own pinhole camera for safe observation of the sun, and find out how it works.

Challenge Level

Is it cheaper to cook a meal from scratch or to buy a ready meal? What difference does the number of people you're cooking for make?

Challenge Level

My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?

Challenge Level

Which dilutions can you make using only 10ml pipettes?

Challenge Level

Can you work out the parentage of the ancient hero Gilgamesh?

Challenge Level

What is the chance this pea plant will look like its parents?

Challenge Level

Investigate the molecular masses in this sequence of molecules and deduce which molecule has been analysed in the mass spectrometer.