Take a look at this formula:
e iπ + 1 = 0
How does it make you feel? Baffled? Intimidated? Indifferent?
If you are a mathematician, this formula is likely to make you feel enthusiastic, inspired and, well, happy. That is because this formula, Euler's identity, is a beautiful formula. It brings together the 5 most important mathematical constants: zero, one, the imaginary number i and the most common transcendental numbers e and pi. Frontiers in Human Neuroscience reports that scientists at University College London found that the part of the brain responsible for helping us feel emotions - the medial orbito-frontal cortex - was triggered when mathematicians were shown 'beautiful' formulae such as this.
These formulae elicited the same emotional response as listening to a favourite piece of music or looking at a stunning piece of art.
So, if you want to cheer yourself up, don't reach for the iPod... do some Maths!