Video: Icicles form amid icy waves on Lake Michigan

Now Playing: Waterfall turned to ice in Minneapolis

Now Playing: Snow and icicles create wintry landscape in China

Now Playing: ABC News Live Prime: Wednesday, January 27, 2021

Now Playing: Confused cat meets her Lego doppelgänger

Now Playing: A grim coronavirus prediction, 1 year later

Now Playing: The Rundown: Top headlines today: Jan. 27, 2021

Now Playing: Reddit community WallStreetBets squeezes short sellers

Now Playing: By the Numbers: The pandemic’s toll on working parents

Now Playing: Author Meena Harris discusses her new book, ‘Ambitious Girl’

Now Playing: Oscar-winning actress Cloris Leachman dies at 94

Now Playing: Amanda Gorman to perform poem at Super Bowl

Now Playing: Rosalind ‘Roz’ Brewer to become Walgreens CEO

Now Playing: Apple urges users to update their devices to fix security flaws

Now Playing: New details emerge in hours long standoff that left mom of 3, pediatrician dead

Now Playing: Biden signs sweeping executive actions to combat climate crisis

Now Playing: Torrential rain, wind slam West Coast as Southwest gets heavy snow

Now Playing: Homeland Security warns of urgent threat to elected officials, government facilities

Now Playing: The Breakdown: Biden signs executive orders to tackle climate crisis

Now Playing: Biden official lays out climate plan