Most of us don't think twice about our gestures other than the fact that they might help us communicate our thoughts more effectively. But while your nods and thumbs up might be fine to use in the US, you might want to think twice before using the same gestures in other countries. Even something as seemingly innocent as keeping your hands in your pockets can be seen as rude in Japan and Korea.
So find out more about what your gestrues could mean in other countries here.