JPL's video demonstrating the engineering challenges in the precise timing of the descent of a human-crewed Mars lander is nail-biting territory. There's a reason they call the landing "seven minutes of terror."
Challenges of Getting to Mars: Curiosity's Seven Minutes of Terror (Thanks, Fipi Lele!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.