- Facebook is a social media and social networking service owned by American technology conglomerate Meta Platforms. Created in 2004 by Mark Zuckerberg with four other Harvard College students and roommates Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes, its name derives from the face book directories often given to American university students. Membership was initially limited to Harvard students, gradually expanding to other North American universities. Since 2006, Facebook allows everyone to register from 13 years old (or older), except in the case of a handful of nations, where the age limit is 14 years. As of December 2022, Facebook claimed 3 billion monthly active users. As of October 2023 Facebook ranked as the 3rd most visited website in the world with 22.56% of its traffic coming from the United States. It was the most downloaded mobile app of the 2010s.
- What is Entropy? (jasonfantl.com)
People say many things about entropy: entropy increases with time, entropy is disorder, entropy increases with energy, entropy determines the arrow of time, etc.. But I have no idea what entropy is, and from what I find, neither do most other people. This is the introduction I wish I had when first told about entropy, so hopefully you find it helpful. My goal is that by the end of this long post we will have a rigorous and intuitive understanding of those statements, and in particular, why the universe looks different when moving forward through time versus when traveling backward through time.
