Science Myth: Urinating on a Jellyfish Sting Helps Cure it.

Unfortunately not. Not sure where this one came from (other than being popularised by Friends in the 1990's) but doing this can actually do more harm than good. In fact the best thing you can do (before seeking medical advice, of course) is to wash the affected area with salt water.

Science Myth: The Tongue Has Zones For Different Tastes.

Unfortunately not. All those experiments we did in Junior school? All lies and confirmation bias. The notion that the tongue is mapped into four areas—sweet, sour, salty and bitter—is wrong.  There are five basic tastes identified so far, and the entire tongue can sense all of these tastes more or less equally.

Science Myth: Water Drains Anti-Clockwise in the Southern Hemisphere

No it doesn't. The Coriolis effect does make cyclones and weather systems spin different ways, but this force is so small in your sink that it has no effect. Instead, it's the way you pour the water in that matters.

Science Myth: You Can Kill A Virus.

Well, you can't. It can be de-activated or destroyed, but you can't kill it. Mainly because it wasn't alive to begin with. The main requirement for something to be considered 'alive', is that it must be able to reproduce and a virus can't do that. It survives only by hijacking a cell first.