Energy is vital, but what is energy? Host Jim Al-Kahlili investigates a strange set of laws that link everything from engines to humans to stars.

Jim Al-Khalili reveals how humanity discovered the rules that drive the universe and mastered the two most important concepts of the modern age – energy and information. As a follow on to the film "Everything and Nothing, the Science of Empty Space," this award-winning science show investigates the laws, from Einstein's General Relativity to quantum mechanics, that link the universe together.