If the radius ? Science Quiz 112 - Switched on kids
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Welcome to the Science Quiz 112

If the radius of the earth is reduced by half, then the day-night on the earth would be of how many hours ? Learn and enjoy science learning with educational toys.  Try quizzing at least 1 hour every time you meet your friends.Email them a quiz every now and then and when you chat with them next time, ask them a tricky question.