What, if any, is the relationship between bandwidth and power? [more inside]
posted on Nov 19, 2007 - 14 answers

Do the green light triggers for motorcycles actually work? [more inside]
posted on Nov 16, 2007 - 11 answers

What would happen if you could create a perfect two-way mirror into a sphere? [more inside]
posted on Oct 30, 2007 - 12 answers

Why do porous objects (wood, textile, hair, etc) appear darker when wet then when dry? A googling gave me this ("surface reflection and refraction"), but that doesn't sound entirely reasonable, as it merely talks of light being scattered, but the light in question is already diffuse. This also gives some suggestions, but nothing conclusive. Any chem/physics MeFiers know this?
posted on Dec 12, 2003 - 7 answers