Why is the tallest building on earth less than half a mile high? Why don't we have mountains as tall as those on Mars? Dr Mark Miodownik investigates the world of the very big and very tall. He reveals that, at this scale, everything is governed by a battle with one of the strangest forces in the universe - gravity. With help from acrobats, levitation devices, spiders and sticky goo, Mark discovers how gravity can make solid rock behave like a liquid and investigates whether it might be possible to build a structure from Earth into space.
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