When Bohr digresses on the fission chain reaction, he indicates that one fissioned uranium atom is enough to move a speck of dust, then "until eventually after, let's say 80 generations, 280 specks of dust have been moved, enough specks of dust to constitute an entire city." Rather than 280, the number is 2^80, as the result of 80 doublings (indicating the rather important carat exponent symbol was left out of the script or omitted by the actor). The number reads as two to the eightieth power... about a trillion trillion.