Quote by Bertrand Russell
"If a tree falls in the forest and no one is around to hear it, it does not make a sound; it makes air vibrations."
More from Bertrand Russell
"Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric."
"The fundamental cause of trouble in the world today is that the stupid are cocksure while the intelligent are full of doubt."
"What is wanted is not the will to believe, but the wish to find out, which is the exact opposite of the will to believe."
"The only thing that will redeem mankind is cooperation."