The journalist Patrick Radden Keefe on trying to unravel the double life and tragic death of 19-year-old Zac Brettler – and what it tells us about London’s dark underbelly
My question is how does a magnet have “endless” energy to, for instance- suspend another magnet. Or to fight gravitational forces to stay bonded to something ferrous? Is it that magnetism itself is the force that is doing “work”?
A new spacecraft concept called NOVA could keep asteroids from hitting our planet by using a huge magnet to gradually pull them apart while shifting their trajectories
