GF meaning in Academic & Science ?

Gravity Falls is an American mystery-comedy animated television series created by Alex Hirsch for Disney Channel and Disney XD. The series ran from June 15, 2012 to February 15, 2016.

The series follows the adventures of Dipper Pines (voiced by Jason Ritter) and his twin sister Mabel (voiced by Kristen Schaal) who are sent to spend the summer with their great-uncle (or "Grunkle") Stan (voiced by Hirsch) in Gravity Falls, Oregon, a mysterious town full of paranormal incidents and supernatural creatures. The kids help Stan run "The Mystery Shack", the tourist trap that he owns, while also investigating the local mysteries.

On November 20, 2015, Hirsch announced that the series would finish with its second season, stating that this was "100% [his] choice" and that "the show isn't being cancelled- it's being finished" and was simply reaching its natural conclusion. The show ended on February 15, 2016, with a one-hour finale, "Weirdmageddon 3: Take Back The Falls". Hirsch later stated that he remains open to continuing the series with additional episodes or specials.

Gravity Falls received critical acclaim with praise directed at its writing, characters, humor, and multi-generational appeal. Additionally, the series won two Emmy Awards, three Annie Awards, and a BAFTA Children's Award, among various other wins and nominations. Gravity Falls garnered high viewership amongst kids, teenagers, and young adults during its run and was Disney XD's highest rated show in 2015 and early 2016, while also setting several ratings records for the network. The series has attracted a broad and passionate fandom and has been considered to be an influence for many animated shows that followed it, and has also spawned a variety of official merchandise including books, toys, and a video game.

In February 2018, on the second anniversary of the final episode of the show, Hirsch used a cipher to announce Gravity Falls: Lost Legends, a continuation of the Gravity Falls story in a new graphic novel that was later released on July 24, 2018. On August 8, 2020, Disney Channel aired a Gravity Falls-inspired episode of the show Amphibia, created by Matt Braly who served as a storyboard artist and director for the show. The episode is titled "Wax Museum", with Hirsch guest-starring. On October 3, 2021, show villain Bill Cipher made a cameo in The Simpsons episode titled "Bart's in Jail," with Hirsch guest voicing him.