Dmitri Mendeleev — "The periodic law is the most important generalization in chemistry, and it has n…"

"It was clear that in the United States there was a development not of the best, but of the middle and worst sides of European civilization; the notorious general voting, the tendency to politics... al…"

"The capital fact to note is that petroleum was born in the depths of the earth, and it is only there that we must seek its origin."

"Experiment itself cannot give truth, but it gives the means of destroying erroneous representations whilst confirming those which are true in all their consequences."

"There is no death, but only change."

"The invisible world of chemical atoms is still waiting for the creator of chemical mechanics."