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I've no idea if it is the same thing, but we used to teach in the classroom
that the ability or inability to roll the tongue into a 'tube' is a
particularly clear example of genetics. It is a textbook classic. However, I
read recently that identical twins often differ in this. It amused me to
imagine how many biology lessons were inconveniently disrupted by identical
twins before the possiblility became 'official'.

[log in to unmask] * http://www.interactives.co.uk
*
Give people facts and you feed their minds for an hour.
Awaken curiosity and they feed their own minds for a lifetime.
*
Ian Russell 

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