This video from KET traces the energy transformations that occur when coal is burned to produce electricity. Some of the mechanical processes are also described.

This problem uses linking cubes as a concrete context for exploring simple multiplication and division, doubling, halves and quarters. The problem displays a rod of 4 cubes and asks students how many cubes are necessary to make rods related to it in a variety of ways. It can be used to introduce key concepts and vocabulary. The Teachers' Notes page offers suggestions for implementation, discussion questions, and ideas for extension and support.

In this adapted ZOOM video segment, cast members get hands-on in the recycling process by using old newspapers to make new paper.

This problem provides an opportunity for children to practice skip-counting and counting on. It lays a foundation for the concept of multiples and proportional thinking. Using linking cubes of two different colors, one color grouped in 2s and the other color grouped in 3s, children look for ways they can make a line of one color equal to a line of the other color. The Teachers' Notes page offers suggestions for implementation, discussion questions, and ideas for extension and support.

In this video segment adapted from ZOOM, cast members make a seismometer and experiment with different ways to make it register movement.

In this article Jenni Back details the use of manipulatives in the mathematics classroom. She describes the results of research studies and her own observations. She draws the conclusion that students need to have various tools available to them and to use them to make sense of the mathematics, not just to follow a rote procedure. Suggestions for ways to implement manipulative use are included in the article.

This video adapted from NASA explains how a magnetometer determines magnetic fields around planets.

A realistic mass and spring laboratory. Hang masses from springs and adjust the spring stiffness and damping. You can even slow time. Transport the lab to different planets. A chart shows the kinetic, potential, and thermal energy for each spring.

Two astronauts aboard the International Space Station (ISS) describe mass and weight and the differences between the two in this video from NASA’s Teaching From Space initiative.

This video segment adapted from Discovering Women profiles Fermilab physicist and Harvard professor Melissa Franklin.

Learn about an important physics experiment that uses an invention that manipulates light in this interactive activity adapted from NASA.

In this video from DragonflyTV, Tiana and Sammy measure, record, and analyze the results of a drop box test to find out how everyday items behave in microgravity.

How do microwaves heat up your coffee? Adjust the frequency and amplitude of microwaves. Watch water molecules rotating and bouncing around. View the microwave field as a wave, a single line of vectors, or the entire field.

How do microwaves heat up your coffee? Adjust the frequency and amplitude of microwaves. Watch water molecules rotating and bouncing around. View the microwave field as a wave, a single line of vectors, or the entire field.

How did scientists figure out the structure of atoms without looking at them? Try out different models by shooting light at the atom. Check how the prediction of the model matches the experimental results.

What determines the concentration of a solution? Learn about the relationships between moles, liters, and molarity by adjusting the amount of solute and solution volume. Change solutes to compare different chemical compounds in water.

Discover what controls how fast tiny molecular motors in our body pull through a single strand of DNA. How hard can the motor pull in a tug of war with the optical tweezers? Discover what helps it pull harder. Do all molecular motors behave the same?

In this interactive activity from ChemThink, learn about covalent molecules and how the VSEPR theory predicts the shapes of covalently-bonded molecules.

Explore molecule shapes by building molecules in 3D! Find out how a molecule's shape changes as you add atoms to a molecule.

This video segment adapted from NOVA relates the dramatic story of vulcanologists trying to predict the timing of the cataclysmic eruption of Mount Pinatubo in the Philippines.