We'll talk to the scientist who is 3D printing replicas of children's hearts to help doctors perform lifesaving surgery. Meet the man who discovered water on Mars. Leo sets steel on fire and takes some great time-lapse photography with the folks from Joby. TWiT Staff's favorite tech of 2015 and what they hope to see in 2016. Call for Help with Captain Jack Ferret and his YouTube videos, and Margot needed some advice on a Linux-specific laptop.
| Name | Type | Role | |
|---|---|---|---|
| Lujendra Ojha | Guest Star | ||
| Zach Settewongse | Guest Star | ||
| Amanda Pollard | Guest Star | ||
| Justin Ryan, PhD | Guest Star | ||
| Stephanie Starks | Guest Star |