Paul Andersen explains how objects interact when touching and at a distance. Electromagnetic forces are very important when objects are touching and fields explain both electromagnetic and gravitational forces. The strong and weak...

Pollen goes unnoticed by most of us, except when hay fever strikes. But microscopes reveal it comes in stunning colors and shapes -- and travels remarkably well. Jonathan Drori gives an up-close glimpse of these fascinating flecks of...

In this video Paul Andersen explains how gravitational forces differ from the other three fundamental forces; electromagnetic, strong, and weak. Gravitational forces are always attractive and operate at all scales. Even though...

Many diseases are driven by metabolites -- small molecules in your body like fat, glucose and cholesterol -- but we don't know exactly what they are or how they work. Biotech entrepreneur and TED Fellow Leila Pirhaji shares her plan to...

Understanding gravity can sometimes be a bit of a balancing act, much like the fundamental laws of physics and how they inform what it is exactly that Earth orbits.

Did you know that when you fall down, the earth falls up to meet you? Explore the counterintuitive equation that describes gravity.

Chemists need stoichiometry to make the scale of chemistry more understandable - Hank is here to explain why, and to teach us how to use it.



Table o
f Contents
Atomic
Mass Units
2:24
Moles
5:12
Molar Mass...

Listen, we know you've thought about it, and we're here to give you THE DEFINITIVE ANSWER to one of the greatest science questions of all time. How long would it take to get to the MOON by farting? Join Gabe on PBS Space Time as we walk...

Population III stars were the very first stars in our universe and far larger than any we can see today. Where are they now?

In this video Paul Andersen explains how modeling instruction can be used in the science classroom. Instead of presenting a model for the students the teacher presents and experience or experiment and the students develop the model.

Master Newton’s law of universal gravitation through intuitive explanations, real-world examples, and full vector analysis. Learn how to calculate gravitational force, understand the inverse square law, and apply Newton’s third law in...

Howcast - Learn how testicular cancer is diagnosed in this Howcast video.

Gout is no longer just for royalty – the disease has spread to the massesSource: Various

Isotopes are just different atoms that represent the same element but have a different mass. In this video, students will learn what is an isotope and how to tell the difference between isotopes of different atoms. This video will make...

Molar mass is the mass of 1 mole of a substance. The molar mass of elements can be found on the periodic table and the molar mass of compounds can be found by adding together the molar masses of the elements present in the compound....

Mars Express, a spacecraft launched two years ago, is entering a crucial phase as it deploys radar booms to scan the Martian surface for signs of water. This mission is significant because there is evidence that water may have existed on...

The molecular formula is the actual formula of a compound and can be found by comparing the mass of the molecular formula to the mass of the empirical formula to figure out how much bigger the molecular formula is compared to the...

Join Vincent, Agathe, and David as they investigate the journey of a bottle thrown into the sea. Inspired by the famous 1992 plastic duck experiment, they study ocean currents, including surface and deep currents, to predict the...

In this video, we explore the Jana Bekoff Effect (or the Intermediate Axis Theorem), which involves the surprising flipping motion of objects like a wingnut in space. This phenomenon, first observed by cosmonaut Vladimir Jana Bekoff in...

Will this be the last video I make about SI units? Quite possibly. There's something about being so precise and defining the systems within which science works. When we can more accurately and routinely measure a kilogram, a mole, a...

By the end of this learning object, the student will be able to: Discover the origin of the universe.

The origin of the universe

This problem is about the acceleration of a ball at the top of its path when thrown up on the surface of a small asteroid.

This problem is about how the gravitational force on a ball changes as it moves up away from a small asteroid.