How can light bend around a black hole when light has no mass?

Further, a photon always travels by the shortest distance between two points. As space time is warped, the light appears to bend around a massive object. ... At the event horizon of a black hole, the space time curves into itself and as a result, light cannot escape from a black hole

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.