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A Dropbox folder being used to store content for the science department at Salem Middle School.

Another video on infrared light.

Looking at water and ice with infrared light helps us understand how light and heat are related.

A quick video introduction to infrared light and how it is different from visible light.

the new James Webb Space Telescope (JWST) is designed for detecting infrared radiation. This animation explains what infrared light is, and how the JWST will use it. Please rate and comment, thanks!

A Steve Spangler video experiment that might be good for teaching students about the Law of Conservation of Energy. Involves making a solar powered oven to convert light energy to heat energy to cook S'mores.

A great VSauce video that introduces colors and how they work. It also addresses why the sky is blue.

NASA Sci Files segment explaining the phases of the moon and how they are created.

This got us thinking: What happens when smaller (and bigger) objects fly into our atmosphere? We used Purdue University's "Impact: Earth!" simulator to find our answers. Our own Bob Al-Greene illustrated the results, as seen in the gallery above.

Some highlights: Rocks the size of basketballs enter our planet about once a month; most burn apart in the atmosphere before they reach the surface. Objects as long as standard school buses (roughly 12 meters around) only sneak into the Earth every 20 years or so - but, as seen in Chelyabinsk, the damage can be much greater.

All results assume the object is traveling at a 45-degree angle, with a density level of 3000 kg/m^3 and a velocity of 11 km/s. Everything is assumed to be seen from 100 kilometers away from the direct impact zone.

Click "Show As List" on the bottom-left of the gallery to view larger images. And check out our Google Hangout with asteroid experts to learn more about what's being done to fend off space rocks, from basketball-sized to London-sized.

A 2013 meteor explosion above Chelyabinsk, Russia injured more than 1,700 people. It was completely unexpected -- and it could happen again. Here's what NASA's doing to make sure we know how to act when (not if) the next one hits.

For the first time in the history of humankind, economical participation in space exploration is a reality. With Mars One's recent launch of a crowdfunding campaign, it's now possible to send a personal item to distances far beyond your wildest dreams. For many, the Mars One mission is the gateway to a new era in man's historic reach for the stars.

For about 50 years, government organizations have been funding and managing space exploration across the globe. Government run exploration, funded by public monies, has provided limited access to most citizens of those countries. In the last few years, private organizations such as Richard Branson's Virgin Galactic and Eric Anderson's Space Adventures have made space exploration possible for the mega-rich. A flight with Virgin Galactic 68 miles above Earth goes for a cool $250,000 while the potential 2017 flight to the moon from Space Adventures is rumored to cost an astronomical $150 million. There are others in between, but none as accessible as Mars One. Bas Lansdorp, co-founder of Mars One, has set his sights on involving the everyday man and woman in space exploration

Mars One will establish a permanent human settlement on Mars. Crews of four will depart every two years, starting in 2024. Our first unmanned mission will be launched in 2018. Participate in this mission to Mars through our crowdfunding campaign.

Mars One will establish a human settlement on Mars. You can participate in the first major step: a private Mars Lander and Satellite mission in 2018.

A father of four, who applied for a one-way-ticket to live on Mars, could be looking at a divorce as a result of his extraterrestrial ambition.

Ken Sullivan made it the next stage of the Mars One project, which could potentially see him making a new life on Mars - but his wife and children are not happy about the news.

Mr Sullivan, who lives in Utah, is among the 1,058 applicants selected so far who could colonise the red planet and never return to their families and friends on Earth.

How the Eye Functions - Diagrams of structure of the human eye. How light waves are refracted by lens of eye & focused on the retina. The lens, its position & changes in curvature. Monocular & binocular vision, retina and function.

The supercontinent Pangaea, with its connected South America and Africa, broke apart 200 million years ago. But the continents haven't stopped shifting -- the tectonic plates beneath our feet (in Earth's two top layers, the lithosphere and the asthenosphere) are still traveling at about the rate your fingernails grow. Michael Molina discusses the catalysts and consequences of continental drift.

The supercontinent Pangaea, with its connected South America and Africa, broke apart 200 million years ago. But the continents haven't stopped shifting -- the tectonic plates beneath our feet (in Earth's two top layers, the lithosphere and the asthenosphere) are still traveling at about the rate your fingernails grow. Michael Molina discusses the catalysts and consequences of continental drift.

This links to the online collection of resources connected to a National Geographic Brain Games episode on color and the way that our brains perceive color. There are lots of neat interactive games and tasks that users can view and complete.