The brain holds some 10 billion neurons, an truly amazing number. But taken one at a time, there is nothing amazing about a nerve cell. If you stimulate one, it will stimulate other neurons to which it is connected. And that is all that a neuron...
Here are the stories of the ten most popular equations of all time as voted for by readers of Physics World, including - accessibly described here for the first time - the favourite equation of all, Euler's equation.
Each is an equation that...