XX XY

This day in history Nettie Stevens was born in 1861.
In 1905 Nettie's experiments identified the
presence or absence of the Y chromosome; basically
if you got the Y then you will grow to be a guy. XY
Females are XX.

Mother Cabrini was the first American to be
canoized by the Catholic Church. Mother's work
opened much needed hospitals and orphanages
throughout the United States. Happy Birthday!

"Snowflakes, leaves, humans, plants, raindrops,
stars, molecules, microscopic entities, all come
in communities. The singular cannot in reality
exist."
~Paula Gunn Allen