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But importantly, this study notes that Mars' redness happened before the water left.

When the mystery of the LRDs first became apparent, professional and citizen scientists alike bandied about alternative theories for the LRDs’ redness, all of which is healthy for the state of scientific discourse.

But beware: There’s a difference between artificial tears and other products only meant to reduce redness.

Acute inflammation is characterized by body temperature increases, swelling, redness and pain.

“And then on top of that, we add all the little freckles and redness and veins and whatnot, just to give the final touch.”