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3D printing technology, using heat-resistant metal alloys, is revolutionizing trial-and-error rocket development. Whole structures that would have previously required hundreds of distinct components can now be printed in a matter of days. The key to fast engine development is to reduce the number of parts, which reduces the time it takes to assemble the engine and the disruption caused by supply chain delays. The easiest way to do this is to change manufacturing processes. Space companies are now moving away from subtractive manufacturing processes-which remove material to shape a part-to additive manufacturing processes that build up a part by adding material to it bit by bit.

Wow, check out the picture of the Meat 3-D printer on this article. "The "meat" is 3D printed, and the mimicry is extraordinary. The molecules of difference that create the flavour of beef, as distinct from that of lamb, are few but extremely powerful. This is certainly the closest synthetic approximation yet."

Travellers will use facial scanners to print and attach a bag tag from a self-serve kiosk and place their bag on the conveyer. They will also use facial scan to pass through the domestic checkpoint in dedicated TSA PreCheck lanes (no need to show a government ID or boarding pass) and at the gate another facial scan will produce a boarding pass. Automation of these services will result in fewer jobs as well as enhanced tracking and identification of passengers.