The world's top carmakers, and getting to know Google Fi -- Our favorite videos of the week

The world's top 5 carmakers

There's a global race to be top automaker. Brian Cooley runs down the top five, as they now stand.

Now playing: Watch this: Top 5: Carmakers in the world

3:42

The history of Motorola

It invented the mobile phone as we know it, and it relayed the first words from the moon. It also made some costly mistakes along the way. We chart Motorola's fascinating history.

Now playing: Watch this: The history of Motorola

3:35

Your incandescent bulbs are ruining your tech cred

Sharon Profis talks incandescents and LEDs on "You're Doing it All Wrong."

Now playing: Watch this: Your incandescent bulbs are ruining your tech cred

1:15

Getting to know Google's wireless service, Project Fi

Using Wi-Fi coverage as default and partnering with Sprint and T-Mobile, Project Fi is an alternative mobile wireless service from search giant Google.

Now playing: Watch this: Getting to know Google's wireless service, Project Fi

2:23

An iPhone with no physical home button is closer than you think

New tech showcases a fingerprint scanner embedded into glass. Plus, Apple has another massive earnings report but gives no details about Apple Watch sales.

Now playing: Watch this: An iPhone with no physical home button is closer than...

4:58