The Schuylkill River in Philadelphia freezes over on Jan. 8, after a harsh polar air spread through the U.S., shattering many low-temperature records that had stood for decades. (Photo by contributor Ike Richman)
This frozen soap bubble only took a minute to freeze. "I used the stirring straw to blow the bubbles almost directly onto the snow. It took several tries before I got the images I was happy with. The picture was taken at night and I used a flashlight wrapped in a blue tissue paper to illuminate it." (Photo by contributor Anna Tymczak)