We are often asked what exactly we do as a team at PNA. That is why we thought it would be fun to present a number of analogies in the series 'What does PNA have in common with...?
A stone and a feather are not really similar. Not in terms of weight, not in terms of hardness, not in terms of shape and, at first glance, not in terms of behaviour when you throw them off a block of flats. Yet both objects are completely subject to Newton's laws of gravity. If the feather were not so light and had a high degree of aerodynamic lift because of its shape, it would fall from the block of flats just as hard as the stone (as can be easily demonstrated by dropping a stone and a feather simultaneously in a vacuum tube). Newton's laws create a framework to which all worldly objects are subject. PNA has developed the same framework of laws and relations for knowledge.