Your hair knows where you've been

Michelle Chartrand of the University of Ottawa performs isotopic analyses on human hair to find out more about a person’s whereabouts and diet.

Photo by Ned Rozell.

Sprouting from your head at the rate of more than three inches a year, hair is a recorder of the things you eat and drink and where you ate and drank them. An Ottawa-based researcher has just assembled a countrywide database of Canadians’ hair designed to help the Royal Canadian Mounted Police.


Alaska creatures without us

Songbirds like this ruby-crowned kinglet would probably do better if people flew away.

Photo by Ned Rozell.

In Alan Weisman’s book, The World Without Us, the author p