Now Playing: Follow the Olympics Online

Now Playing: Google Makes the Internet Faster

Now Playing: Elon Musk Unveils His Plan For Colonizing Mars

Now Playing: Techbytes: Most Tweeted Presidential Debate Topics

Now Playing: SpaceX Unveils Plan for Manned Mars Mission

Now Playing: Snapchat Now Offering Camera-Equipped Sunglasses

Now Playing: Solar Powered Backpacks Light Up Student's Lives

Now Playing: Apple Releases New Music Feature to Compete With Spotify

Now Playing: No Injuries After Massive Explosion Rocks SpaceX Launch Site

Now Playing: Samsung Recalls Galaxy Note 7 Smartphone

Now Playing: Apple's Big iPhone 7 Announcement

Now Playing: ARCHIVAL VIDEO: Meet Siri, Apple's Latest Invention

Now Playing: Super Mario To Hit iPhones Soon

Now Playing: New IPhone 7 Unveiled

Now Playing: New Apple Watch Is Waterproof, Has GPS

Now Playing: IPhone 7, New Apple Watch Unveiled

Now Playing: First Look at the New iPhone 7

Now Playing: Smartphone Apps May Help Users' Diet and Physical Activity

Now Playing: RAW: Explosion Rocks SpaceX Launch Site in Florida

Now Playing: Facebook Messenger Rolls Out In-App Payments