When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Cold water weighs more than hot water.
93
Your brain is 80% water.
525
German chemists made a replica of a trophy the size of one molecule.
68
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Out of all the senses, smell is most closely linked to memory.
146