In this issue:

"Immune Engineering" by Antonio Regalado.

"Precise Gene Editing in Plants" by David Talbot.

"Conversational Interfaces" by Will Knight.

"Reusable Rockets" by Brian Bergstein.

"Robots That Teach Each Other" by Amanda Schaffer.

"DNA App Store" by Antonio Regalado.

"SolarCity's Gigafactory" by Richard Martin.

"Slack" by Lee Gomes.

"Tesla Autopilot" by Ryan Bradley.

"Power from the Air" by Mark Harris.

"Should Silicon Valley Go to War?" by Fred Kaplan.

"Apprentice Work" by Martin Gayford.