/ do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
Sir Isaac Newton
Modern scientists still feel as Newton did about the great ocean of undiscovered truth. In Scientific American, some topflight authorities describe the challenging mysteries that keep today's scientists baffled.
The Mystery of Matter. Matter is common stuff, but the scientists do not know what matter is....