The ice keeper

The Science Life

DENVER — “I’m a little tired of the cold,” Geoff Hargreaves says with a sigh.

Vasileios Gkinis of the University of Colorado Boulder examines layers in an ice core that reveal environmental changes over time. Gifford Wong/Wais

Jeff Kanipe

No surprise there: Hargreaves works in a deep freeze — 38 degrees Celsius below zero (−36° F).