Join the conversation on Twitter at #whatifmachine.

Jetpacks are among the most prevalent of transportation gizmos in video games yet somehow, in real life there is still no sign of us zipping to and from work in one. Why is this? And how close are state-of-the-art prototypes to the jetpacks we see in games?

As ever, I'd love to hear your feedback on the show. With the first season now over, we're taking suggestions for show topics in season two later in the year. Drop all ideas and such in the comments or prod me directly via Twitter @camfrazrob.

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Thanks again for watching and for everyone's kind words. See you next season.