When you think of cat and fish, you don't usually think about friendship. But this cat and fish are truly extraordinary.
We all like to think that people will never forget where they came from. That after making it anywhere in life, they will always give back and be humble too. That they will remember what their struggles were...That exactly how Lana the dog acts.
Today, about a third of the world's population is infected with a strange disease called toxoplasmosis — and most of them never even know it. And while the parasite can multiply in practically any host, it can only reproduce sexually in the intestines of cats. Could this disease be the reason so many people love cats and keep them as pets? TED ED shares what we know about toxoplasmosis.