Practise your skills of proportional reasoning with this interactive haemocytometer.
Can you work out which drink has the stronger flavour?
Use your skill and knowledge to place various scientific lengths in order of size. Can you judge the length of objects with sizes ranging from 1 Angstrom to 1 million km with no wrong attempts?
Making a scale model of the solar system
Many physical constants are only known to a certain accuracy. Explore the numerical error bounds in the mass of water and its constituents.
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?
My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?
In Fill Me Up we invited you to sketch graphs as vessels are filled with water. Can you work out the equations of the graphs?
Is it really greener to go on the bus, or to buy local?