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4. The Eiffel Tower Can Be 15 cm Taller in the Summer The Eiffel Tower, made of iron, can expand and contract with temperature changes. In the summer heat, the iron expands, making the tower grow by up to 15 centimeters (about 6 inches). Conversely, in cold weather, the tower contracts.
2. Octopuses Have Three Hearts An octopus has three hearts: two pump blood to the gills, while the third pumps it to the rest of the body. Additionally, their blood is blue because it contains a copper-based molecule called hemocyanin, which is more efficient at transporting oxygen in cold, low-oxygen environments.
6. There Are More Possible Iterations of a Game of Chess Than Atoms in the Known Universe The number of possible unique chess games is staggering. It is estimated to be 10^120, which far exceeds the number of atoms in the observable universe, roughly estimated to be 10^80.