Dmitri Mendeleev — "The chemical elements are not created, but are transformed."

"My father was a director of the local gymnasium, and my mother was a woman of strong character and great intelligence."

"The future of Russia is in its oil and its people."

"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 structure of the elements is a matter of the internal structure of their atoms."

"The greatest joy of the scientist is in discovering some new truth, some new regularity, some new law."