On December 24, 1968 the astronauts on board Apollo 8 took one of the most famous photos in history - the rise of Earth above the horizon of the Moon. This video shows how that photo came about.

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To celebrate we've pulled out some of our best articles & videos looking at the basics of light, light in nature, lasers & energy!

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Check out the REMUS SharkCam as it searchers for and is found by Great White Sharks.

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Not sure of the difference between ophthalmologist, optometrist and optician? In this whiteboard animation, you can learn about how each of these three eye care providers work together to provide the best care for your eyes.

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The average, healthy human can distinguish between well over a million different shades.

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Studying bubbles and CO2 helps discover ways to improve oil recovery.

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How can you see the shockwaves formed when an aircraft flies faster than the speed of sound? NASA engineers figured out how to do this as part of their research into ways to make quieter supersonic aircraft.

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Newer, more powerful telescopes can capture images at millions of light years away, giving us a glimpse of strange new worlds.

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How do you know what you're seeing is real? These Illusions bring about the truth! (Video courtesy of ASAPScience)

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