Did you know that gravity is weaker in North America than it is in Europe, East Asia, Australia, and North Africa? Well, I didn't. Apparently it's because Earth is not a perfect sphere, and its interior mass is not evenly distributed. There are slight variations of gravitational pull depending on where on Earth’s surface you are.
In fact, you can now check to see which points on the Earth’s surface have the strongest and weakest gravitational pulls with a “gravity map”, available at BBC.com. The map is a 3-dimensional model of the earth that represents the amount of gravitational pull on a specific point on the Earth as its altitude. It uses data compiled from the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE).
As my friend Miley Cyrus always says, "that's pretty cool!" Source: OMG Facts, BBC [Image via Tree Hugger]