Although they have never been directly seen , these particles are theoretically the building blocks of the bigger particles -- protons , neutrons and electrons -- that form the universe as we know it . Lead ions have collided for the first time inside a massive machine in Europe . Score: 6 Scientists are working with basic elements to understand how atoms came together .
Lead ions have collided for the first time inside a massive machine in Europe . Score: 6 Scientists are working with basic elements to understand how atoms came together .