Usain Bolt has run 100 metres in 9.58 seconds. Could he go any faster?
Thinking is hard work. How long does it take for our brains to need a break?
It’s every astronaut’s worst nightmare – but does losing pressure really mean your head will explode?
Chao Lu has accurately recited 67,890 digits of pi from memory – but even that only hints at the brain’s true capacity
Extreme cold can endanger your life – or save it
The devil’s in the detail of water and vitamins
Rats that are kept awake die after two weeks. You probably wouldn’t make it that long
If roller coasters hold no fears for you, you may be a g monster
How long could you stay at the top of Everest without extra oxygen?
Andy Bolton managed 457.5 kilograms – can the human frame take any more?
The gruesome story of an unfortunate scrap dealer’s glow-in-the-dark keepsake
Stephane Mifsud managed 11 minutes and 35 seconds – but such feats take their toll
Training and the will to win are a good start, but to be an elite endurance athlete you need something special
Daniel Kish lost his sight in infancy – but taught himself to echolocate with bat-like clicks. Here he tells New Scientist how to do it