the hike up

Bright Angel Trail, 9.5 miles up from Phantom Ranch

Dr. Seuss trees at Indian Gardens, half way up

OK, here's a weird thing:  at a certain point in the hike, everything started appearing super bright green, from the plants, the dust on our shoes, even the squirrels.  I couldn't figure it out, and other hikers said they experienced it too.  A park ranger told me it was the sun.  I think it was a mineral in the earth down there that is in the water or something and makes everything phosphorescent green.