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  Science debates
Human cloning
Designer babies
Animal testing
Joined twins

 
Conjoined twins Joined twins
Joined twins occur in about one in 100,000 pregnancies.

The twins come from a single fertilised egg, so they are always identical and the same sex.

Only around 19 pairs have been dealt with at UK hospitals since 1984.

There is always a debate over whether to separate joined twins, especially when it may mean that one twin will die.

The question that is often asked is: "Do we value one normal life more than two less able lives?"


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