What is general relativity?  Stephen Wolfram and Lex Fridman  Summary and Q&A
TL;DR
General relativity is a theory that explains gravity as the curvature of space caused by mass, while quantum mechanics focuses on the behavior of particles. Both theories have been successful in explaining observed phenomena.
Questions & Answers
Q: How did physics evolve from ancient Greece to the 20th century?
In ancient times, philosophers constructed models of the world without experiments. Newton introduced mathematical principles, which led to using equations to understand the world. Einstein later developed general relativity and quantum mechanics theories.
Q: What is the main idea behind general relativity?
General relativity suggests that when there is mass in space, it curves space itself. This curvature of space causes objects to follow paths that appear curved to us, explaining the force of gravity.
Q: How does quantum mechanics differ from general relativity?
Quantum mechanics focuses on particles and their behavior, while general relativity explains gravity and the curvature of space caused by mass. Quantum mechanics deals with the microscopic world, while general relativity deals with the macroscopic world.
Q: How do general relativity and quantum mechanics relate to the theory of everything?
General relativity and quantum mechanics are two theories that contribute to the search for the theory of everything. They provide different perspectives on the behavior of the universe at different scales.
Summary & Key Takeaways

Physics in ancient Greece focused on constructing models of the world, without much emphasis on experiments.

Isaac Newton's mathematical principles of natural philosophy allowed for the computation of planetary features and marked the beginning of using mathematics to understand the world.

General relativity, developed by Einstein in 1915, explained gravity as the curvature of space caused by mass, while quantum mechanics dealt with the behavior of particles.