Inside Science’s top science stories for January Video

Now Playing: Inside Science’s top science stories for January

Now Playing: Amazon made $200 billion in annual sales last year

Now Playing: Tesla Model Y coming next year

Now Playing: How a teen ‘stumbled upon’ Apple’s FaceTime bug

Now Playing: Lawsuit filed over Apple FaceTime bug

Now Playing: Apple disables Group FaceTime after privacy concern

Now Playing: Group FaceTime bug allows for eavesdropping

Now Playing: CES 2019 kicks off in Las Vegas

Now Playing: This day in history: Jan. 9, 2007

Now Playing: Nissan unveils new LEAF at CES

Now Playing: Apple’s stock takes a hit

Now Playing: Amazon now worth more than any other publicly traded U.S. company

Now Playing: A sales slowdown for Apple

Now Playing: This day in history: Jan. 4, 2004

Now Playing: CES ready to kick off in Las Vegas

Now Playing: Samsung unveils ‘car of the future’ at the Consumer Electronics Show in Las Vegas

Now Playing: Apple misses release window for AirPower

Now Playing: NASA makes space exploration history

Now Playing: Royale introduces the first foldable phone at CES 2019

Now Playing: ‘Baby Shark’ hits the Top 40