Some parts of the sea are saltier than others. The Atlantic Ocean for example has two huge deserts of extra salty water. To see which parts are saltier than the other, NASA's Aquarius instrument aboard Argentina's Aquarius/SAC-D spacecraft released the first year of data.
You can see it in the image above, red and orange areas are very salty, while green and blue areas are less so.
Here's a very important development in technology. The engineers over at Hendo just released a video of their real-world Back to the Future style hoverboard. It works, and they're showing it off. Read more