Last month，American scientists began work on a project aimed at improving the ability to predict tornadoes.The project is said to be the largest tornado study in history.It is called Verification of the Origins of Rotation in Tornadoes Experiment Two.The shorter name is VORTEX2.

　　VORTEX2 involves a team of nearly one hundred people，many of them scientists.They are using radars and other equipment to learn more about how，why and where tornadoes form.The team is using forty cars and trucks to chase tornadoes，dropping measuring instruments in their paths.In addition，unmanned aircraft are collecting information from inside storms.

　　The first Vortex project took place in nineteen ninety-four and nineteen ninety-five.The results helped scientists better understand super-cells.They are the severe thunderstorms that produce the most deadly and destructive tornadoes.This time，scientists hope to learn more about the formation，wind speed and shape of tornadoes.

　　1．Why are tornadoes also called twisters？(no more than 5 words)

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　　2．Where can we find tornadoes most common？(no more than 2 words)

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　　3．Where is the best place for people to hide when tornadoes strike？(no more than 16 words)

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