Mitch Burrow and the alien rock.

Jessie Christiansen and the Goldilocks retraction.

Vito Gesualdi old-timey popcorn salesman.

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.