SciShow
Twins x Twins = Twins?
If identical twins had children with identical twins, would their children also be twins? The short answer is no, and the video explains why by relating the DNA of siblings to that of identical twins and the long-term implications of the...
PBS
Pbs Learning Media: Sesame Street: Song: We're Twins
A song about twins! Twins are brothers and sisters who were born on the same day, but that doesn't make them the same. This song teaches appreciation of differences and similarities. [1:42]