You can choose the size of the video you would like to embed below. Next, copy the embed code that is available in the box below. Paste this code on to your website to display the video.
If you experience problems embedding videos, please contact us.
April 25, 2014 AT 9:49 PM
For a while, scientists have thought that the Y chromosome (which determines whether a person is male) may become extinct in tens of millions of years due to shrinkage (loss of genes). New research shows that the Y is actually quite stable, and has been for about 25 million years.