What philosophical question is used to illustrate the importance of observation and perception?

• If a tree falls in a forest and no one is around to hear it, does it make a sound?

• What came first, the chicken or the egg?

• What is the sound of one hand clapping?

• If a cat is in a box, is it alive or dead?

What was one of Voltaire's most significant critiques during his lifetime?

• The American Revolution

• The Industrial Revolution

• The English monarchy

• The Catholic French monarchy

Which of Voltaire's works was banned for its religious blasphemy and political hostility?

• The Social Contract

• Letters Concerning the English Nation

• Candide

• Philosophical Letters

What philosophy did Voltaire argue against in his work 'Candide'?

• Empiricism

• Existentialism

• Rationalism

• Leibnizian optimism

What did Voltaire believe was crucial for a better society?

• Strict adherence to tradition

• Religious tolerance and freedom of speech

• Complete government control

• Isolation from other cultures