today seems impossible or that no one has before, what would it be?

If I could I would invent an aircraft that could detect a commercial aircraft about to fall from the sky, that could arrive in milliseconds and pluck the aircraft from the sky before it could crash.

A cure for cancer

I'd plant a money tree

Yea, I want to live long enough to see money grow on trees.

I would make nail polish that goes on like a marking pen...

so much easier!

I would make a monster that looks like a clown. Because that's what a real mad scientist would do.

Avocado roll-ups.

A toilet seat that warms up!

a endless supply of chocolate machine.oh and world peace.

Somebody already thought of that. You just gotta look online to find out who sells them.

I want one of those Jetson machines that washes you... brushes your teeth... gets you dressed & does your hair & makeup for you! I think it even gets your coffee!!!

Can't forget world peace.

A virtual reality celebrity hand job machine

Oh heck yea. Good one.

I have had one of these before.

yeah but have it come in a cabana boy model lol

i did invent an engine that runs on air, and another that runs on magnets, i just have to present it correctly, and i think i've figured it out.....most get threatened, but i think i found away to get around that finally. lets hope......