Curious when the ocean freezes? Learn how salt affects freezing and why sea ice forms in only the coldest climates.

Antarctic icefish have clear blood, no hemoglobin, and antifreeze proteins that let them survive freezing seas.

Most assume that cold water is deadly for fish. The truth is, nature has incredible exceptions. In polar oceans and snowy lakes where temperatures hov.

Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States.