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Should we study the Fresnel Equations that deal with reflectance and transmittance? They're sort of tied to refraction.

Do you guys have any techniques for differentiating American Elm and Slippery Elm? So far all I have are weak comparisons: Slippery Elm is more folded mid-vein, has a rougher surface, and more visible veins. Even if these did work consistently, they might not be testable if there's only an image to ...

Do you guys have any good recommendations for places to buy mirrors? So far, me and my partner have been using some pretty big 8cm x 8cm mirrors that have deteriorated, so I'm looking for some new ones to try out a different size or type.

What exactly are you supposed to give for a "measure of central tendency" for Division C Statistics? Is it still just mean, median or mode, even though that's a separate item? Or is it something else? Our team got marked off at an invitational for not having it, even though I think we list...