Over the past 50 years we got versions of X-ray specs and...

Over the past 50 years we got versions of X-ray specs and space vacations, and even death rays. But the X-ray specs don't fit on your face - they're big things that screen your luggage for guns. Space vacations are real, but they cost $20 million. We have death rays, but you have to be a triple Ph.D. to play with them.