Oh, ok. I was concurring with the comment that said
"There are plenty of inventions yet to make" and not really voicing an opinion about their difficulty.
However, after rereading it, I disagree with the top comment that said that "Centuries ago, it was easier to think of things to invent".
It's never easy to think of something to invent. Finding the problem, even just thinking there might be a problem where noone sees any, is a big part of any invention.
Also, in the past, inventions required a much larger leap of thinking than today. When we speak today about growing wings on creatures born without it, we kind of accept the idea, because we know it's already possible to grow eyes on flies' legs for example.
But inventing the steam engine, or disproving "spontaneous generation" and inventing vaccines, sound to me much more impressive because those people went where no one had dared go before them.
