Jetpacks: why aren't we all flying to work?

It’s not as if the tech hasn’t shown promise, but jet propulsion has never become part of our daily lives. Here’s whyThose of a certain age may remember the opening ceremony of the 1984 Olympic Games in Los Angeles. As Rafer Johnson lit the eternal flame, a man strapped into a rocket-propelled backpack launched himself across the arena above the ticker tape and balloons, landing gracefully on the track before a TV audience of 2.5 billion.It was a moment of triumph seeming to he