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• Why do cats purr?
• Why was St. Basil's Cathedral built in Moscow?
• Why is the color purple associated with royalty?
• Why is excessive alcohol consumption bad for your health?
• Why did the Steller's Sea Cow become extinct?
• Why is AIDS deadly?
• Why did Steve Jobs create apple?
• Why do helium balloons float?
• Why is the air transparent?
• Why did the attack on Pearl Harbor occur?
• Why did the Great Auk die out?
• Why did the Tasmanian tiger become extinct?
• Why did Marie Curie become a scientist?
• Why did Bill Bowerman create Nike?
• Why did Adolf Dassler create Adidas?
• Why does Venezuela have the largest oil reserves?
• Why does the United States have the largest economy in the world?
• Why did the Vikings conquer part of northern Europe?
• Why is the Viking civilization over?
• Why is the Egyptian civilization over?

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• Why did all dinosaurs become extinct?
• Why do people cry?
• Why did the gold standard system come to an end?
• Why plants are considered as living things?
• Why was Big Ben built in London?
• Why is excessive alcohol consumption bad for your health?
• Why did the Second World War begin?
• Why was there an oil crisis in 1973?
• Why was the Brandenburg Gate built in Berlin?
• Why is the Kuwaiti Dinar the most valuable currency in the world?

• Why is Facebook banned in China?
• Why did the Egyptians build the pyramids?
• Why does the Moon look different throughout the month?
• Why are plants green?
• Why do cats purr?
• Why is the color purple associated with royalty?
• Why are some people left handed?
• Why did Steve Jobs create apple?
• Why do we have seasons?

• Why are people born with down syndrome?
• Why was the Forbidden City built in Beijing?
• Why is cholesterol bad for your health?
• Why was the Royal Palace built in Madrid?
• Why are Persian rugs expensive?
• Why do we have seasons?
• Why is France a developed country?
• Why are galapagos sea lions in danger of extinction?