Hollywood technology used to bring Gollum to the screen in the Lord of the Rings blockbusters has been used by scientists to understand how kangaroos bounce. Experts have been puzzled as to how the animals – especially when they become larger – are able to attain high speeds without breaking their bones. But by using motion-capture technology, which records and analyses information from markers stuck on to the body, and infrared lights which illuminate the animals, they have been able to track their motion and force. More..