What hasn't been invented yet?

[mouview]

A way to turn a man into a woman

JK Rowling would agree.

[rrhf]

Drone bidets.
A drone that can spray water on your arse after you do a poop.

[Mad Mentor]

I think one thing we should be wary about from history is definitively dismissing or backing any particular tech. Self driving vehicle would be highest on my wish list.

[Orior]

Already invented is cordless vacuum cleaners with headlights. I have to say they're the dog's bollix.