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Then move through space towards the Earth in successive orders of magnitude until you reach a tall oak tree just outside the buildings of the National High Magnetic Field Laboratory in Tallahassee, Florida. After that, begin to move from the actual size of a leaf into a microscopic world that reveals leaf cell walls, the cell nucleus, chromatin, DNA and finally, into the subatomic universe of electrons and protons.
I don't know if this has been posted before, but this stuff blows my mind! I find it endlessly fascinating and IMHO, it's worth seeing again:)
A quark is one of two currently recognized groups of fundamental particles, which are subatomic, indivisible (at least as far as we know today) particles that represent the smallest known units of matter. Twelve fundamental particles - six quarks and six leptons (the other type) - are the basic building blocks for everything in the universe.
Thought everybody knew that.
In England though Quark is the sound that a posh duck makes.