Imagine discovering a cheap, simple gadget that you use at least once a day because it does a much better job of making something you crave than all the fiddly, expensive devices you tried before.
Then imagine finding out that, in all the years you have had your treasured contraption, you have not been using it properly.
This was one of two things I learnt from spending an hour on Zoom last week with Alan Adler, the 85-year-old American who invented the AeroPress. This super quick, virtually self-cleaning coffee maker has gained a cultish following across the world since its launch in 2005, despite looking very much like a big plastic needle-free syringe.