Whether you're happy to admit it not, from time to time we all cry. But how? Why? And are all tears the same?
In fact, no! You might be surprised to find out that there are in fact three different kinds of tears: basal, emotional and onion... no, just kidding, the final one is actually called reflex. Fundamentally all tears serve as a form of protection, but this video gives some detail about each type and why they're so important. Which might just be enough to make you more comfortable at the prospect of having a blub. Maybe? [YouTube]