It's been a momentous 24 hours for inventors around the world: first of all 32-year-old Tom Pellereau – creator of the curved nail file and visionary behind pain-free chairs and the prototype emergency biscuit – won this year's Apprentice. Next came news that the first mass-market flying car could, apparently, be on sale in the UK within five years. And to follow? Well, Comment is free is hoping its readers might be able to help.

What else is missing from our world? Tell us about your own ideas for inventions and why they fill a gap in the market. We want to hear of dreams and machines that will trump all of the above. Don't tell us the sky's the limit when there are footprints on the moon – give us something that will change people's lives forever.