BRAIN CANDY LIVE THE VSAUCE CURIOSITY BOX: Links to sources and to learn more below! my twitter my instagram Thanks to Eric Langlay ( ) for producing, editing, and animating this episode with me. Thanks also to Henry Reich ( ) for his advice and guidance. Universe Sandbox² : Mass vs weight: Great Veritasium video: two other great videos: and baseballs coming together under gravitational attraction can be simulated in Universe Sandbox 2. More math behind it can be found here: Weight to mass (on surface of Earth) convertor: pencil and Earth falling numbers: NASA HD footage: Buoyancy: Earth’s spin and its effect on ‘down’: The measurement of Earth and its gravity: Movement of Earth’s center of mass: you get heavier before you get lighter as you descend into Earth: vertical deflection: practical uses of measuring gravity: geoid: Interactive Earth geoid: your weight when moon is overhead: Hammer and feather drop on moon: Why things fall at the same rate: Wolfram Alpha cone geodesic tool: General Relativity: simple animation showing geodesic on cone and how it causes motion DOWN in space: GREAT pbs spacetime video (watch the whole channel): #sec-straight ~jdnorton/teaching/HPS_0410/chapters/spacetime/ time and gravity: tests of general relativity: RECOMENDED BOOKS: great introductory texts: “Relativity Visualized” by Lewis Carroll Epstein There’s also this PDF that takes Epstein’s diagrams into more detail: “Relativity Simply Explained” by Martin Gardener great intro to the math of general relativity: “A Most Incomprehensible Thing: Notes Towards a Very Gentle Introduction to the Mathematics of Relativity” by Peter Collier Requires some background in relevant math topics (see above) but very very good: “Spacetime And Geometry: An Introduction To General Relativity” by Sean Carrol