The words Lu Ting displayed were sharp, each one a direct challenge.
“Do you know why water flows downhill, never up?”
“Do you know why drinking cold water can make you sick, but boiled water does not?”
“Do you know why sound travels faster than an arrow loosed from a bow?”
“Do you know why coal burns, but stone does not?”
“Do you know why lions and tigers can produce offspring, but a dog and a cat cannot?”
“And finally, why are
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