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" ... But you can also measure a distant galaxy’s recession speed, and in a Universe dominated by dark energy, that speed will increase over time: an acceleration. The expansion rate drops, asymptoting to a constant (but positive) value, while the expansion speed increases, accelerating into the oblivion of expanding space. Both of these things are simultaneously true: the Universe is accelerating and the expansion rate is very slowly dropping. At last, now you finally understand how it happens, too. ... "
" ... This might sound like an impossibility at first, as the gluons themselves are massless particles. But you can think of the forces they give rise to as springs: asymptoting to zero when the springs are unstretched, but becoming very large the greater the amount of stretching. In fact, the amount of energy between two quarks whose distance gets too large can become so great that it's as though additional quark/antiquark pairs exist inside the proton: sea quarks. ... "