My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?
Can you work out which drink has the stronger flavour?
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?
Which dilutions can you make using only 10ml pipettes?
Can you work out the parentage of the ancient hero Gilgamesh?
Make your own pinhole camera for safe observation of the sun, and find out how it works.
Investigate the molecular masses in this sequence of molecules and deduce which molecule has been analysed in the mass spectrometer.
When a habitat changes, what happens to the food chain?
What is the chance I will have a son who looks like me?