The travel velocity of these two wave types is not the same (P-waves are faster than S-waves). Thus, if there is an earthquake somewhere, the first waves that arrive are P-waves. In essence, the gap in P-wave and S-wave arrival gives a first estimate of the distance to the earthquake.
With the mysterious U.S. Senator Eddie Morra (Bradley Cooper) providing him with a second drug to counteract NZT's deadly side effects, Brian uses his enhanced abilities to help FBI agent Rebecca Harris (Jennifer Carpenter).
Ted's crush on a neighborhood girl named Audrey (voice of Taylor Swift) leads him on a quest to fulfill her greatest wish: to see a real tree. Outside of town, Ted encounters a strange man called the Once-ler, who tells him the story of the trees and the Lorax (voice of Danny DeVito) who tried to save them. Ted has a caring and innocent nature, and he is moved by the story the Once-ler tells.