What is the biggest city in the world ? What is the fastest vehide in the world ? What is the most dangerous animal? Where is the most expensive What is the oldest animal? Who is the richest person ? What is the smallest country? Where is the tallest buil

The biggest city in the world is Shanghai The fastest vehicle in the world is ThrustSSC The most dangerous animal is Mosquito The most expensive city is Hong Kong The oldest animal is sponge (760 mln years) The richest person is Bill Gates The smallest country is Vatican The tallest building in the world is Burj Khalifa in Dubai