First of all, this was manifested in the discovery of a whole host of new subatomic particles. They are usually called elementary particles, but not all of them are truly elementary. Many of them, in turn, consist of even more elementary particles. Truly amazing results were obtained in the middle and second half of the twentieth century in those branches of physics that are studying the fundamental structure of matter. First of all, this was manifested in the discovery of a whole host of new subatomic particles. They are usually called elementary particles, but not all of them are truly elementary. Many of them, in turn, consist of even more elementary particles. Truly amazing results were obtained in the middle and second half of the twentieth century in those branches of physics that are studying the fundamental structure of matter. First of all, this was manifested in the discovery of a whole host of new subatomic particles. They are usually called elementary particles, but not all of them are truly elementary. Many of them, in turn, consist of even more elementary particles. Truly amazing results were obtained in the middle and second half of the twentieth century in those branches of physics that are studying the fundamental structure of matter. First of all, this was manifested in the discovery of a whole host of new subatomic particles. They are usually called elementary particles, but not all of them are truly elementary. Many of them, in turn, consist of even more elementary particles.