A man from Saskatchewan has invented an affordable, motorless 3-D printer. He raised over $700 000 from crowd sourcing to fund his research!

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It all changed with the invention of the telescope ...

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This video talks about Lumens. When you're shopping for light bulbs, compare lumens to be sure you're getting the amount of light, or level of brightness, you want.

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This video discusses lighting choices. Today, there are more lighting options in stores that will save you energy and money.

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All radiation is not created equal! This video from the US National Defense Education Program explains the difference between ionizing and non-ionizing radiation and how we can detect and measure radiation.

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Even though they don't have eyeballs, sponge larvae are still able to differentiate between different intensities of light.

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This DNA Day question was answered by Heather Auld.

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Nature's spectacular light show in the sky is solar powered.

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We know how to make fire, but what actually IS fire?

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