Ask any of my friends, and they’ll tell you I always have my nails done. Sure, maybe it’s because I’m a beauty editor, but I’ve been a manicure girlie since I was a little kid. As much as I love the ...

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Gels are materials composed of a three-dimensional crosslinked polymer or colloidal network immersed in a fluid. They are usually soft and weak, but can be made hard and tough. Hydrogels are gels that ...

Classical conditioning is a form of associative learning in which a neutral stimulus (conditioned stimulus, CS) is paired with another stimulus (unconditioned stimulus, US) that brings about an ...