Released nearly 30 years ago, the original Jurassic Park is a landmark in filmmaking and an iconic part of the 1990s. Showing audiences the wonder and terror of revived dinosaurs on the big screen, the film is, in many ways, the ultimate blockbuster. Since its release in 1993, Jurassic Park hatched tons of sequels, tie-ins and merchandise and gained just as many fans. Those devotees have their own Jurassic Park theories about the movie's timeline, including one that could change everything.
Source：https://www.cbr.com/jurassic-park-theory-no-dinosaurs-hammond-lied/
