I'm showing my age a bit...but when I was a kid we were promised personal jetpacks, flying cars and a machine that would make me a peanut butter and jelly sandwich at the touch of a button.
. . . . . . . . . . . . . . . .
Likewise, except here it's Peanut Paste and Honey.
But where did all these promises come from? Not in "scientific magazines" like
Popular Mechanics by any chance - or am I going back a few too many decades?
Yes,
Popular Mechanics was very interesting but hardly the ultimate scientific authority.
But, sometimes
experts, as I thought myself[1] 
do get it wrong.
I saw in
Radio and Hobbies that these little solid-state thingos made from flue dust were going to replace the
vacuum tube.
I
knew that was impossible, the was no way of controlling
electron flow, other than in a vacuum!
It sort of turned out that I was "a bit wrong" - and all these transistors started turning up.
I've learned a little since then, enough to realise that maybe I'm such an expert after all.
PS I wish it was only sometimes that I got things wrong, but that's life!
And I was told that in
expert "The
ex is the
unknown you're trying to find and the
spurt is the
little drip under pressure."
[1] You know, when I was young enough to
know that I knew everything.

But, this is a very "educational" website, it encourages so much research into "why"!