A temperature check is conducted at a Trump campaign rally last month in Toledo, Ohio. Stephen Zenner/LightRocket via Getty Images hide caption
temperature
The sex that a turtle develops into is determined by the temperature that an embryo experiences when it's inside the egg. Ye et. al / Current Biology hide caption
The Josephine Shaw Lowell Memorial Fountain at Bryant Park in New York City was frozen on Tuesday, as New Yorkers return to work after the holiday break. Timothy A. Clary/AFP/Getty Images hide caption
During the day on Aug. 21, large swaths of farmland will be plunged into darkness, and temperatures will drop about 10 degrees. Scientists are waiting to see how crops and animals react. Daniel Acker/Bloomberg/Getty Images hide caption
A Los Angeles County fire helicopter makes a night drop while battling the Fish Fire above Azusa, Calif., on Monday. Gene Blevins/Reuters hide caption
Temperatures are taken two ways at Casablanca's airport: with an infrared body scanner (left) and a handheld thermometer (right). Abdeljalil Bounhar/AP hide caption