Error message

Deprecated function: Array and string offset access syntax with curly braces is deprecated in include_once() (line 20 of /home/raw3y9x1y6am/public_html/includes/file.phar.inc).

refraction

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?

414

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?

Pages