In 1997, NASA bought a Boeing 747SP for what might be both a super cool and super absurd purpose. Turn it into SOFIA, a flying telescope.

What killed George Washington? Turns out it was probably related to the bloodletting and other 18th-century medicine his doctors applied.

In this video Paul Andersen shows conceptual thinking in a mini-lesson on causal relationships.

T
ERMS:
Cause - a thing that gives rise t
o an event
Ef
fect - an event
Relationship - interconnection betwe
en parts of...

Work-life balance, says Nigel Marsh, is too important to be left in the hands of your employer. Marsh lays out an ideal day balanced between family time, personal time and productivity -- and offers some stirring encouragement to make it...

This week we are looking at your parasympathetic division, which is the "resting and digesting" unit. Unfortunately, learning about this de-stressing division also involves a whole lot of memorization. Don't worry, though - we've...

We may not be sure who’s behind it, but we can tell you that the Charlie Charlie Challenge doesn’t really work. Because physics.Very, very special thanks to Henry Reich of Minute Physics for helping with the content of this video.

From spirals to spots to fractals, nature is full of interesting patterns. Many of these patterns even resemble geometric shapes. One of the most common? Hexagons. Why do we see this six-sided shape occur so many times in nature? This...

The One That Got Away (Size Matters)

Almost all matter in the universe should have been annihilated shortly after the Big Bang, but looking around, we see galaxies, stars, planets, and, you know... us. So obviously that didn't happen, and the why of it may have something to...

In this video Paul Andersen shows conceptual thinking in a mini-lesson on explaining stability and change. Two examples are included in the video and two additional examples are included in the linked thinking slides. ...

Ever wonder what keeps you from falling over when you’re riding your bike? Jessi, with the help of some other SciShow Kids, shows you the answer!

In this video Paul Andersen begins by discriminating between translation and rotational motion. He then explains how a torque is the product of the lever arm and the force perpendicular. The lever arm must be perpendicular to the axis...

In this video Paul Andersen explains how the pressure, volume, amount, and temperature of an ideal gas are related. Absolute zero of a gas can be determined by varying the temperature and measuring the corresponding volume of a gas...

Levers are a simple machine that help us make work easier. But how do they work and how can you make one to help you? Check out this episode with Squeaks and Jessi to learn all about levers!

America's school systems are funded by the 50 states. In this fiery talk, Bill Gates says that state budgets are riddled with accounting tricks that disguise the true cost of health care and pensions and weighted with worsening deficits...

Mr. Andersen explains the basics of balancing chemical equations. A visual guide shows you how to change coefficients to balance the atoms in reactants and products.

Video on how using parallel structure makes writing balanced.

Howcast - Learn how to do the b-boy dance move known as a baby freeze in this Howcast breakdancing tutorial with choreographer Victor "Kid Glyde" Alicea.

Howcast - Learn how to do a front plank on an exercise ball for six pack abs from certified personal trainer James Rizzo in this ab workout video from Howcast.

Howcast - Learn how to do a step up with a bosu ball from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to stay model thin without starving yourself from model scout Trudi Tapscott in this Howcast video.

Howcast - Learn how to adjust the tension on a sewing machine from designer Jennifer Wiese in this Howcast tutorial.

Howcast - Learn how to find your bowling stance from former PBA touring player Mike D'Ambrosio in this Howcast bowling video.

Howcast -Learn how to read a hand's "three worlds" from psychotherapist and palm reading expert Ellen Goldberg, M.A. in this Howcast video.