Someone sells a hoverboard by 2030

Created by qznc on 2020-01-03; known on 2030-12-31

• qznc estimated 5% on 2020-01-03
• qznc said “From https://news.ycombinator.com/item?id=21941998” on 2020-01-03
• Bruno Parga estimated 7% on 2020-01-04
• pranomostro estimated 5% and said “Do we know how this could be implemented technically in practice?” on 2020-01-11