This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:

"Albert Einstein’s general theory of relativity is a landmark in our understanding of the universe. It gave rise to the notion of a spacetime continuum against which all physical phenomena play out. But over the decades, it has inspired many questions that have yet to be answered: How can Einstein’s equations describe forces other than gravity? And what are the "dark" forms of energy and matter that cause the universe to expand and galaxies to evolve? In a new article, author Piotr Ogonowski offers a seemingly simple solution – the theories of spacetime and electromagnetism are describing the same things. Beginning from Einstein’s field equations, Ogonowski reveals their ability to describe all known physical interactions, including those described by classical electromagnetism. Spacetime, it appears, may simply be the way we perceive electromagnetic fields..."

The rest of the transcript, along with a link to the research itself, is available on the resource itself.

How big and how old is the universe? This culminating telescope investigation for high school students has them first taking images of galaxies near and far; then measuring and calculating their distances; then predicting how they might expect galaxies to be moving based on various models of gravity; and then comparing their results with the galaxy velocity measurements in a NASA database. From this data, students explore the concept of an expanding universe and can actually determine an estimate for the age of our universe. This activity is part of a DVD that is a professional development resource for educators. Many new astronomy learners, students and adults alike, are unfamiliar with the universe beyond the solar system. Instructions for obtaining the DVD and registering for the professional development workshop are contained on the website.

In this engaging unit, students will design and plant a square-foot garden that will be their central tool. Through the growing season, they will explore nutrition content in their everyday lives and see how it relates to what they are growing.

Experiments in this class are broadly aimed at acquainting students with the range of properties of polymers, methods of synthesis, and physical chemistry. Some examples of laboratory work include solution polymerization of acrylamide, bead polymerization of divinylbenzene, and interfacial polymerization of nylon 6,10. Evaluation of networks by tensile and swelling experiments, rheology of polymer solutions and suspensions, and physical properties of natural and silicone rubber are also covered.

Students learn about the Earth's water cycle, especially about evaporation. Once a dam is constructed, its reservoir becomes a part of the region's natural hydrologic cycle by receiving precipitation, storing runoff water and evaporating water. Although almost impossible to see, and not as familiar to most people as precipitation, evaporation plays a critical role in the hydrologic cycle, and is especially of interest to engineers designing new dams and reservoirs, such as those that Splash Engineering is designing for Thirsty County.

This activity relates water temperature to fishery health within inland freshwater watersheds as a way to explore how environmental factors of an ecosystem affect the organisms that use those ecosystems as important habitat.

Students learn the decibel reading of various noises and why high-level readings damage hearing. Sound types and decibel readings are written on sheets of paper, and students arrange the sounds from the lowest to highest decibel levels. If available, a decibel meter can be used to measure sounds by students.

This lesson introduces the concepts of longitudinal and transverse waves. Students see several demonstrations of waves and characterize them by transverse and longitudinal behavior. This lesson also introduces the Sunken Treasure theme of the Sound and Light unit a continuous story line throughout the lessons.

In this activity, students play the game Simon Says to make the amplitudes and wavelengths defined by the teacher. First they play alone, and then they play with a partner using a piece of rope.

In this video segment adapted from Navajo Technical College, meet two members of the Navajo Nation, one Elder and one scientist, as they share their observations about how precipitation has changed since they were children.

This is a 30 minute lesson where students will be able to:
1. Describe the size, composition, and motion of meteors and comets.
2. Discuss the similarities and differences in comets and meteors.
3. Explain:
a. what happens to meteors as they fall through the atmosphere
b. why comet debris is observed as a meteor shower from the Earth
c. how the planet's gravitational forces affect a comet's orbit.
d. why we see a comet's tail.
e. why a comet disintegrates when it gets close to the sun.

SSAC Physical Volcanology module. Students build a spreadsheet to calculate the volume a tephra deposit using an exponential-thinning model.

This activity describes the construction and use of a pneumatic cannon and free falling target used to teach the concepts of projectile motion in introductory physics.

Explore tunneling splitting in double well potentials. This classic problem describes many physical systems, including covalent bonds, Josephson junctions, and two-state systems such as spin 1/2 particles and ammonia molecules.

Students learn about the Earth's only natural satellite, the Moon. They discuss the Moon's surface features and human exploration. They also learn about how engineers develop technologies to study and explore the Moon, which also helps us learn more about the Earth.

In this lesson students investigate the effects of black carbon on arctic warming and are introduced to a mechanism of arctic warming that is not directly dependent on greenhouse gases in the atmosphere: black carbon deposition on Arctic snow and ice. It can also be used to introduce the concept of albedo. Prerequisite knowledge: students understand the concepts of absorption and reflection of light energy. This lesson is designed to be used with either an Earth/environmental science or chemistry curriculum. It may also be used as an enrichment activity in physics or physical science during a unit on energy. Includes suggested modifications for students with special needs and low technology option. Requires advance preparation, including freezing ice samples overnight.

Published in 1989 by Prentice-Hall, this book is a useful resource for educators and self-learners alike. The text is aimed at those who have seen Maxwell’s equations in integral and differential form and who have been exposed to some integral theorems and differential operators. A hypertext version of this textbook can be found here. An accompanying set of video demonstrations is available below.
These video demonstrations convey electromagnetism concepts. The demonstrations are related to topics covered in the textbook. They were prepared by Markus Zahn, James R. Melcher, and Manuel L. Silva and were produced by the Department of Electrical Engineering and Computer Science at the Massachusetts Institute of Technology.
The purpose of these demonstrations is to make mathematical analysis of electromagnetism take on physical meaning. Based on relatively simple configurations and arrangements of equipment, they make a direct connection between what has been analytically derived and what is observed. They permit the student to observe physically what has been described symbolically. Often presented with a plot of theoretical predictions that are compared to measured data, these demonstrations give the opportunity to test the range of validity of the theory and present a quantitative approach to dealing with the physical world.
The short form of these videos contains the demonstrations only. The long form also presents theory, diagrams, and calculations in support of the demonstrations.
These videos are used in the courses 6.013/ESD.013J and 6.641.

In this video adapted from the Arctic Athabaskan Council, learn how warmer temperatures in the Arctic are transforming the landscape, triggering a host of effects such as permafrost thawing and insect infestations.

This course was designed to educate students about how nuclear weapons came into being, the physics of these weapons, how they are structured, how they have evolved over the past several decades, efforts to control them and limit the threats that they represent, and what the possibilities for the future are. Many people in our country and other countries are not aware of what an existential threat nuclear weapons represent, and this lack of awareness is an important part of the overall threat. 
The course was taught by an MIT Iterdisciplinary team coordinated by Robert P. Redwine, Professor of Physics Emeritus.  The full list of instructors is listed on the course page.

Introduction to Oscillations and Waves covers the basic mathematics and physics of oscillatory and wave phenomena. By the end of the course, students should be able to explain why oscillations appear in many near equilibrium systems, the various mathematical properties of those oscillations in various contexts, how oscillations and waves are related, and the basic mathematical description and properties of a wave.
This course was offered as part of MITES Summer, a six-week, residential STEM experience for rising high school seniors. MIT Introduction to Technology, Engineering, and Science (MITES) provides transformative experiences that bolster confidence, create lifelong community, and build an exciting, challenging foundation in STEM for highly motivated 7th–12th grade students from diverse and underrepresented backgrounds.