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The colors of a butterfly's wings are caused by tiny scales. Do they all produce colors in the same way?


I took this photo on the beach in St. Augustine. The Sun had just peaked over the horizon, and formed a bright column of light above it. Why?


I took this photo on a boat excursion on the Colorado River. A recent comment asked why the sky is blue. OK, so why is the sky blue? And why is it bluer on some days and less blue on others?


I took this photo during a boat ride on the Colorado River. I liked the way the canyon walls reflected in the water near the boat's wake. Since the water was crystal clear, why do you see the reflection of the canyon, instead of seeing through to the bottom of the river?