The other day, in rummaging a suitcase for newspaper clippings of my essays written over forty years ago, I came upon some old objects, among them an old and enormously bulky album.
It's a place where you can see the cost of the struggle, like the Ottoman-era buildings with their roofs blown off and sea walls raked by machine-gun fire.
In the Mesa Verde area of the ancient North American Southwest, living patterns changed in the thirteenth century, with large numbers of people moving into large communal dwellings called pueblos.
Physicist Sean Carroll has become a bit of a rock star in geek circles by attempting to answer an age-old question no scientist has been able to fully explain: What is time?