As we recover from last week's frigid polar vortex, we're reminded of the best viral videos from that time. Our major lesson from these videos: Cats don't know how to walk in deep snow.
Other cool clips include scientists experimenting with levitating objects through the power of ultrasonic waves. These waves can combat the gravitational forces of small objects such as screws or bits of wood.
See also: The 40 Most Viral YouTube Videos of 2013
Lastly, this week's recap also features Google's compilation of the biggest moments of 2013; the video covers everything from the royal baby and Batkid to the tragic Boston Marathon bombing.
Watch the video, above, for our entire viral video recap.
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Image: YouTube, realmaxsol