Last time, we saw that Einstein explains the falling of the apple by the upwards acceleration of the ground. This is Einstein’s happiest thought. But wouldn’t this imply that the surface of the Earth is expanding outwards? Well, no. Why? Because of spacetime curvature! At last, this video explains how Einstein’s gravity really works.

## More on Science4All

Spacetime of General Relativity Spacetime of General Relativity

By Lê Nguyên Hoang | **Updated:**2016-01 | **Views**: 12541

Most popular science explanations of the theory of general relativity are very nice-looking. But they are also deeply misleading. This article presents you a more accurate picture of the spacetime envisioned by Albert Einstein.

Space contraction and time dilation | Relativity 6 Space contraction and time dilation | Relativity 6

By Lê Nguyên Hoang | **Updated:**2016-03 | **Views**: 1918

What's wrong with that map? Relativity 9 What's wrong with that map? Relativity 9

By Lê Nguyên Hoang | **Updated:**2016-03 | **Views**: 10713

Curved-space geometry | Relativity 10 Curved-space geometry | Relativity 10

By Lê Nguyên Hoang | **Updated:**2016-03 | **Views**: 3420

Hyperbolic Geometry | Relativity 11 Hyperbolic Geometry | Relativity 11

By Lê Nguyên Hoang | **Updated:**2016-03 | **Views**: 1943