Google is positioning Duo to make video chat a human experience, and from what we've seen so far they might just pull it off.

There's obviously still plenty about Duo we don't know yet, and won't know until it is finally available later this summer.

What we've seen so far promises a lot, and it's on Google to deliver.

With this option, a friend who knows your e-mail address – presumably a friend – can find you and send you a friend request.

You could also choose “Nobody” in which case, I think someone would have to type in your Oo Voo ID directly.

For years we've been sold on the idea that smartphones with great front-facing cameras would enable the ability to simply pick up your phone and call someone through video, but rarely does that experience go smoothly even between two people who are familiar with how the tech works.

This is where Google wants its new video service, Duo, to shine.If Duo is able to improve on what Google already has for video chats, it's going to be a big deal.The most important part of Duo for Google's target audience, however, is this one tiny detail in "Knock Knock." Google has made a big deal of how you get a video call and see live video of the person calling through this Knock Knock feature, and that does seem very cool.Video and audio quality adjust seamlessly to match the network quality both sides are currently experiencing, and transitioning from Wi Fi to mobile networks is expected to be equally as smooth.We've seen small attempts to make this happen in Google Hangouts, and over the last year there have been tremendous improvements.When I'm not around, things frequently go differently.