The Mathematical Elegance of the Grand Canyon

  I leave today for a backpack with my two kids off the North Rim of the Grand Canyon. Per our usual, we are going without maps, compass, gps, or a trail. This is how we do it together, traveling by line of sight, letting geography show us the way out and back. I used […]

Going Paleo in Florida

The Florida panhandle got some big press this week, yet another early human find confirmed in North America, people entrenched along the Aucilla River south of Tallahassee 14,550 years ago. This came from an underwater excavation where archaeologists have been plumbing a sinkhole through which the river flows. Artifacts and megafauna remains have gathered in the […]

Damage Patterns

The other night I was in the midst of writing about the Ice Age when I strayed to the internet. Up came the Pulitzer Prize for breaking news photography that went this year to New York Times photographers Mauricio Lima, Sergey Ponomarev, Tyler Hicks and Daniel Etter for their coverage of the European refugee crises. Fresh from writing a […]

Coming of Age

  A few years ago, I joined a group of families on a backcountry kayaking trip in Alaska’s Prince William sound. A kid named Will was just about to turn 13, and I was there to watch him come of age. I’d known him as a strong little wild-haired monkey, but on this trip he […]

Outmoded Diseases: An X-File for Osteomyelitis

  I won’t use her name. How she got the disease no one knows. Her leg was cut off at the knee to stop the infection from spreading, and her name is omitted because she is a respected scientist. What happened in her case verges beyond science. The disease is osteomyelitis. It means, simply, bone infection. In X-rays, […]

Live from the Bering Land Bridge

My desk is a mess, skulls, books and papers strewn. The cast of a saber-tooth cat skull sits on the corner, resting on its two double-edged daggers, reminding me of the book I am writing about the first people in North America, and what they encountered. As I crab myself over the keyboard, the Smilodon skull […]

Getting Out of the Jail of Time

Time is a jail that we’ve built for ourselves, I think as I look at the clock and realize this post is due by some daunting hour of the morning. How could this day have been contained by a big hand and little hand on the face of a clock? Sometimes, or some places, the clock […]

The Mark We Leave

Rounding a corner in Manhattan last week, I saw a handprint spray-painted on a wall. It was my hand. I had put it there last summer, my first and only piece of graffiti. It was nothing special, no artistic flair other than my five fingers. I had gloved my hand in plastic wrap and waved […]