How did a 'Flower of Kent' change the course of science?

The Flower of Kent is a green variety of cooking apple. According to the story, this is the apple Isaac Newton saw falling to ground from its tree, inspiring his laws of universal gravitation.

That's the one. That tree hasn't survived in any form,unsurprisingly,but the variety has. It's rare but there is certainly a specimen in the Royal Horticultural Society's gardens at Wisley, Surrey (with over 700 other varieties of apple).