Irina Skaya and the giant ferriswheel of hooks.

Manan Arya and the origami mohawk.

Sarah Keller and the Hohmann orbital ballasts.

Liz Friedman, Jimmy O Yang and the South Pole schwag.

Richard Rieber and the Martian wheel code.

Michael Shellenberger and the future of San Onofre.

Andy Weir and the first city in space.

Robert Zubrin and the pioneering spirit.

Paul Zaloom and the puppet on mars.

Konstantin Batygin and the quantum planets.