Formed of the symbols of Einstein's ground-breaking E=mc2 equation, see if you can separate the two pieces of each metal puzzle and then reattach them. Developed in 1905, Einstein's famous theory enabled people to fully grasp the correlation between mass and energy. Even if you can't understand the intricacies of the equation itself, attempting to solve this puzzle provides just the sort of mental stimulation that Einstein would have loved! Just one piece from the Einstein puzzle range. Is your brain big enough for them all? 8+