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) and riveting", stating that the conversion of Bill Potts into the Mondasian Cyberman and the revelation at the end of the episode "packed more punch" than Jackie Tyler's Cyber-conversion in the second series or Oswin Oswald being revealed as a Dalek in the "Asylum of the Daleks". Mulkern ended his review with praise towards the cliffhanger ending: "The close of World Enough and Time is sublime. Steven Moffat’s script deftly cuts between two scenes of revelation, expertly shot by director Rachel Talalay." World Enough and Time (Doctor Who) "World Enough and Time" is the eleventh and penultimate episode of the