They did it by sending the light through super-cooled sodium atoms, which worked "like molasses" on the photons.
Read all about it here.
38 miles per hour? That's about half as fast as I usually drive :-P
So much for light being a constant!
So, did the light actually slow down, or did time speed up?
Time's going by too fast anyway. We don't need science "helping" it along :-P
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