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Compare DNA molecule vs Methane CH4 molecule vs Carbon dioxide CO2 molecule vs Water H2O molecule vs Hydrogen H2 molecule vs Hydrogen atom vs Helium atom vs Uranium 235 nucleus vs Electron (classical size, larger than actual) vs Proton vs Neutron vs Electron (Experimental upper bound) vs Quantum Foam vs Planck Length in real size on SizeAll. See the items together at true proportional scale.