What happens when you approach the speed of light? This video segment adapted from NOVA follows one of Albert Einstein's thought experiments and his quest to find the answer. [7:05]

So we've all heard of relativity, right? But, what is relativity? And how does it relate to light? And motion? In this video episode of Crash Course Physics, Shini talks to us about perspective, observation, and how relativity is REALLY...

Take a closer look to see if there is a relationship between relative angles of the axes in reference frames. [7:21]

As counterintuitive as it might sound, it will become extremely convenient to use the same units for space and time. Here's how. [4:57]

Here we'll see how classical physics predicts scenarios that disagree with what we observe in nature. Something's got to give. [8:03]

Thinking about how Earth's relative velocity to hypothetical luminiferous ether can be used to detect ether.

Let's see how we can start to solve problems by introducing Minkowski spacetime diagrams. [13:43]