What causes stuttering?

What causes stuttering, how do living things produce oil and why do adults develop alle...
16 October 2015

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What happens to the rubber that comes off tyres, what causes stuttering, how do living things produce oil, why do you develop allergies in adulthood, how can one blood clot in the brain cause so much damage, are memories only stored in the brain and does taste develop in the womb?

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