"I am a bitter drink that powers the modern world. I was discovered by goats. I fuelled the Enlightenment and the Industrial Revolution. Without me, half the world would not wake up properly. What am I?"

Answer: Coffee. Legend says coffee was discovered when an Ethiopian goatherd noticed his goats were energised after eating certain berries. Coffee houses in 17th century Europe became centres of intellectual debate. Today it is one of the most traded commodities in the world.