I've visited this site couple weeks ago: http://www.nobel.se/physics/educational/matter/1.html This remind me the history about old theories of matter. Ancient theory told that any matter can be splitted continously until Alchemist made periodic table. Then we belive that proton, neutron and electron is the fundamental element composing matters. And now, the most fundametal element we can 'found' are quarks. I have some thought bothering my mind; - So... we haven't actually 'know' the most fundamental element, yet? ...And quarks is just a 'physical/math modelling' to manipulate matter? - Quarks still have several different properties. I think the most fundamental elements should have identical properties. Or at least a pair of elements, as all philosophy of almost anything in the universe; there are pairs: good and bad, plus and minus, one and zero, male and female, etc... - Is there any other (newer) method to analyse matter? ...Instead of collide them (or shooting) with other matter? - WHY they're spinning? Is the spin itself a fundmental property we have to 'accept without further question'? Vortex streams show that matters have tends to spin. Galaxies, stars, planets, moons, atoms are spinning. Electro-magnetic, 'spin' electric current (electrons) to create magnetic fields. My basic is engineering, not physics. Please, clear me up?