Nothing

If you could un-invent something, what would it be?

There is nothing that I want to un-invent. If something is not useful for one might be useful for another. Everything that has been invented has been invested with time, patience, struggles, hopes, tears, failures, hard earned money and finally success. So, no there is nothing that I want to un-invent.

Another thought is, anything that has come to be, has its meaning and use for their existence in this world. Nothing is useless.