"Meteors appear in different colors, depending on the chemical composition of the space rock and the air it is passing through. A meteor with high iron content, for instance, will appear yellow. A meteor with high calcium content may appear as a purple streak of light."
Correct. But the point is that we know how to make long lasting products, but we don't because we want more money.
#3 Stupid fact. Paper are largely for stupid people.
#24 i u derstand her
#50 This is right.
V is indeed the speed rating (V=240km/h) on the depicted tyre. R is also a valid speed indicator, for maximum speed 170km/h. If R was the speed indicator it would be alone at the end like the V is here.