Facts on twins

• 40% of twins invent their own languages.

• Identical twins have different fingerprints.

• Twins can have completely different skin tones.

• Twins start interacting in the womb at 14 weeks.

• Identical twins can develop different diseases.

• It is possible for twins to have different dads.

• Once you have one set of non-identical twins, you are 3-4 times more likely to have another set.

• Nigeria has the highest rate of multiple births and the most identical twins.

• China has the lowest rate.

• Twins can have different birthdays (longest gap is 63 days).

• The 'Jim twins' were separated at birth but went on to lead identical lives

• Mothers of twins live longer.