1.This British grass snake exhibits dicephalus, a condition related to conjoined twinning. It is caused during development by high incubation temperatures.
7.This twinning allows for a particular kind of deformation, termed 'pseudo-elasticity', where the material can undergo considerable strain without suffering any permanent damage.
8.Town twinning is not a new idea, but it has become more popular in recent years because it's now easier to find out about and visit other countries and towns.