Funny. Einstein needed to call a reference body something in his special theory and so used a train. For the general theory the train wouldn't do, because it wasn't sufficiently deformable, so he used a mollusk.
experts on birds, beetles, mollusks and the likeFunny. Einstein needed to call a reference body something in his special theory and so used a train. For the general theory the train wouldn't do, because it wasn't sufficiently deformable, so he used a mollusk.
(laughing)