Einstein's theory of relativity is one of the cornerstones of modern physics but it requires a total rethink of our notions of time and space. Strange things happen in a relative universe: length and time are not fixed and depend upon your frame of reference. If you move at high speed, time slows down, space contracts and weight increases. So a period of time for someone on Earth that lasts for hundreds of years may only be a couple of hours for someone travelling in a rocket close to the speed of light. It's mind-boggling stuff, but the theory of relativity has a real impact on our world today.
Creating and harnessing energy is a fundamental part of enabling life to exist and thrive on Earth. Energy comes in a vast array of different forms, using our muscles and those of other creatures, enabling us to move, lift etc, creating heat and steam through fire, capturing the power of the wind in a ship's sails or to turn the blades of a wind turbine, harnessing the power of moving water to generate electricity in a hydroelectric power station, applying the forces of magnetism to turn an electric motor, using solar panels to transfer the sun's energy into electricity for our homes all of these and more are explained in 'Discovering Energy'.
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