Hiking Rim to Rim

Petja and I hiked Grand Canyon rim to rim this past August. Don't ask
why we picked August, the hottest month of the year. The National
Park website essentially says that while most people (read smart
people) are hiking in the mountains this time of year, some people
(read stupid people) still make the trip down below the rim.

Grand Canyon has the distiction of being the deadliest national park
and most of the casualties are from falling or from heat exhaustion.
Carrying enough water is critical, as is avoiding the heat. They
advise not to hike between 10:00 and 4:00 which is why we casually got
up and hit the trail at 6:45.