waves

272

Tree frogs can be very small, but very loud. How can they tolerate making such loud sounds?

288

These are ripple marks in beach sand, made by the wind. Similar ripples can be seen in deserts, and even in large playground sandboxes. What causes the ripples to be so evenly spaced?

321

These rainbows are caused by some of Nancy's prisms. Why is there no green in these rainbows?

323

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

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