If Earth was a perfect sphere of uniform density, then gravity would be consistent. But it's not, which means gravity varies wherever you go. A garden gnome from Germany, nicknamed Kern, travels the world to find out how much he weighs in different places.
So far, Kern has journeyed more than 20,000 miles across 15 countries, by plane, train, ship, bus and car. And as Kern travels, his weight varies, due to a combination of the spin of the Earth and the fact that our planet is not round, but more potato-shaped, according to scientists.