Lever a place to stand, and I shall move the Earth with it' is a remark of Archimedes who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria). It is assumed that in ancient Egypt, constructors used the lever to move and uplift obelisks weighing more than 100 tons. A lever is a beam connected to ground by a hinge, or pivot, called a fulcrum. The ideal lever does not dissipate or store energy, which means there is no friction in the hinge or bending in the beam. In this case, the power into the lever equals
World Enough and Time (Doctor Who) World Enough and Time (Doctor Who) "World Enough and Time" is the eleventh and penultimate episode of the tenth series of the British science fiction television series "Doctor Who". It was written by Steven Moffat, directed by Rachel Talalay, and was broadcast on 24 June 2017 on BBC One. The episode received overwhelmingly positive reviews from television critics. In the episode, the Doctor (Peter Capaldi), Bill (Pearl Mackie), Nardole (Matt Lucas), and Missy (Michelle Gomez) answer a distress call from a gigantic ship trying to escape a black hole. It is the first episode of a two-part story which concludes