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What scientific thinkers and achievements have led to vast improvements in optics over the centuries? Discover the fascinating ways that our understanding of light informs the world in which we live. (4:16 min.)

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The latest clinical trials for poop pills that can fight a gut infection failed. But that's no reason to flush this research down the toilet. (3:29 min.)

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Without math, would our seafaring ancestors ever have seen the world? Great mathematical thinkers and their revolutionary discoveries have an incredible story. Explore the beginnings of logarithms through the history of navigation, adventure and new worlds. (4:18 min.)

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Through advances in crystallography, scientists have learned a lot about the structure of snowflakes. While they all start pretty much the same, once they start crystallizing, it’s true that no two snowflakes are alike. (2:39 min.)

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For several centuries, people thought diseases were caused by wandering clouds of poisonous vapor. We now know that this theory is pretty ridiculous, and that diseases are caused by specific bacteria. But how did we get to this new idea of germ theory? Tien Nguyen describes the work of several scientists who discredited a widely accepted theory in a way that was beneficial to human health. (4:38 min.)

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This ChemMatters episode explains the science behind calories and nutrition facts labels. Find out how scientists first determined the calorie content of food in the 1800s, and how fat, protein and carbohydrate levels on nutrition facts labels are found today. (6:11 min.)

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Why does the calico coloration only occur in female cats? It happens because in order for proper development to occur in females, one of the x chromosomes must be switched off resulting in different active x-chromosomes in different cells This can produce a variety of phenotypic expressions. (5:16 min.)

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Erin Gonzales spoke at Mohawk College in Hamilton about her work as an entrepreneur. Her company, Bread’n Batter, shares a piece of Filipino tradition through baked goods and sweets.

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Jeff Hannah spoke at Mohawk College in Hamilton about his work as an entrepreneur. His company, Next Era Building Inc., is working towards creating a better quality of life by designing innovative buildings.

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Emily Stencel spoke at Mohawk College in Hamilton about her work as an entrepreneur. Her company, Perk Naturals develops a range of natural skincare products.

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