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) the idea of Missy filling the Doctor's shoes was far more interesting. He also stated that some scenes were "bordering on unwatchable for young children" and "too slow and filled with exposition". Scott Collura of IGN gave the episode a 9.0, admiring the character development of Missy through the episode, as she is finally depicted as "out and about as the Mistress", and how Steven Moffat does a good job of deconstructing the name and meaning of the show. He went on to praise "World Enough and Time" as a great buildup for the season finale, noting that "like the