Smelling odours that aren't there can be annoying. It can also be a sign of a serious underlying condition.
Synaesthesia – a rare experience where the senses merge – comes in many different forms.
We can see at a finer resolution than the spacing between individual photo-receptors in the eye – and it's all down to our brains.
New breakthrough in how to test proteins linked to touch and movement could have major implications for strokes, diabetes, spinal injuries and much more.