Amazing science facts that are difficult to grasp.

Pleural effusions are when excess fluid get caught between two layers of tissue (the visceral and parietal pleurae) surrounding the lungs. This fluid can build up over time, taking up space in the lung and impairing a person's ability to...

Understand the differences between TIV (dead virus) and LAIV (alive, but weakened virus) and who should get which one. Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical...

This Khan Academy resource is a video about what a Supernova (Supernovae) is.

For a bigger and better light show, try experimenting with amplitude, frequency, and even the source of the sound (try your favorite song). Add in a friend and you"ve now got a dueling laser-light show!

This group of lessons introduces the use of scientific notation to express very large and very small values. This lesson is 12 of 18 in the series titled "Scientific Notation."

This group of lessons introduces the use of scientific notation to express very large and very small values. This lesson is 15 of 18 in the series titled "Scientific Notation."

This group of lessons introduces the use of scientific notation to express very large and very small values. This lesson is 8 of 18 in the series titled "Scientific Notation."