Is it possible that The Flash (superhero) could exist?

Absolutely not. No. Just no. Never. Not in a thousand years, not in a million years. The amount of energy you would need to burn to achieve such speed is ridiculous. The human body could never handle it. read more

Potentially possible: Invisibility. There has been enough progress in invisibility cloaks, since the first one was made five years ago, that these could actually exist down the road. Right now, we have cloaks that can hide objects a few inches high under visible light and there are schemes to make a real Harry Potter-like wrap-around cloak. read more