General relativity is easy. Nowadays, it can be made as intuitive as universal gravity and its inverse square law by using the right approach.The main ideas of general relativity, like those of special relativity, are accessible to secondary-school students. Black holes, gravitational waves, space-time curvature and the limits of the universe can then be understood as easily as the Doppler effect or the twins paradox.[Motion Mountain]
Penso che la stamperò per leggermela e verificare se è davvero così facile (che per la strada solita non sono mica mai arrivato in fondo).