Are you much sleepier in the morning than the adults in your life? That’s because your body and their bodies produce melatonin at different times.

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Go to any paint store or nail-polish shelf and you’ll see a dozen or so variations of the color black. Even inside a crayon box, there are a lot of shades. But what is the blackest black out there? (3:22 min.)

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In this winning entry for the 2014 Flame Challenge Physics Girl explains the mystery of color. How we see colour is very complicated and involves wavelength, reflection, signals and perception (3:50 min.)

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What you see is not always what you get! Sometimes this is caused by the physical structure of the eye while at other times it is your brain that is editing out (or adding) as it tries to make sense of the world. (2:54 min.)

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Most people depend on sight more than any other sense to interact with the world. But millions of people worldwide are either blind or have impaired vision. Fortunately, modern medicine is finding ways to improve and even restore sight!

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Is invisibility real? Kind of. By manipulating your perception of how light rays interact with an object, you can see around or through the object.

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Your eyes don’t always capture the world exactly as a video camera would. But the eyes are remarkably efficient organs, the result of hundreds of millions of years of coevolution with our brains. Michael Mauser outlines the similarities and differences between your eye and a video camera. (4:56 miln.)

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CurioCity resources which align with New Brunswick's Biology 122/121 (Grade 12) Curriculum Unit 3: Maintaining Dynamic Equilibrium II

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Sometimes our eyes do weird things. One of the things that it sometimes does is get floaters. What are they? Where do they come from? Join us today on SciShow as Hank explores the science behind these little specks.

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CurioCity resources which align with the Northwest Territories Biology 30 Unit A: Nervous & Endocrine Systems

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