Explanations:
Ships float in water based on buoyancy theory. The credit for first identifying this principle goes to Archimedes According to Archimate Principle the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to weight of the fluid that of the body displaces. Niels Bohr - On the basis of quantum ideas, he explained the spectrum of hydrogen atom and presented a theory of nuclear fission. Kepler - Theory of motion of planets of solar system