Yawns are more contagious among people with closer relationships.
163
Up to the age of six or seven months a child can breathe and swallow at the same time. An adult cannot do this.
165
Identical twins do not have identical fingerprints.
79
A chance of a woman having twins is increased after the age of 35. About 1 in 27 women will give birth to twins after this age. After 50 the chances of having twins is 1 in 9.
51
There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
20