By Annette Gulati
Photo by Nannette Bedway
Try this to find out. Coat one of your fingers with a thick layer of soft margarine or peanut butter. Dip that finger and one other finger into ice water. Why does one finger feel warmer than the other? Think of your own best answer, then read ours below.
The finger coated in margarine or peanut butter should feel warmer. These foods contains fat, which acts as an insulator. The fat keeps the finger warm by holding in heat. Many marine mammals have a layer of insulating fat, called blubber, under the skin. Blubber holds in heat and protects these animals from cold temperatures.