In response to The Daily Post’s weekly photo challenge: “Symmetry.”
The evolution of biological structures and functions from existing ones, for example a forearm from a fish fin, has been studied for centuries. But how do entirely new things evolve? It’s a tricky question to answer, but Vincent Lynch, PhD, assistant professor of human genetics at the University of Chicago, and his colleagues shed some light on this process in a new study published online today in Cell Reports.
Taking a look at the origins of pregnancy in mammals, they identified large-scale genetic changes that marked the transition from egg laying to live birth. The researchers found thousands of genes that evolved to be turned on or off in the uterus in early mammals, including many with critical functions in establishing maternal-fetal communication and suppressing the mother’s immune system so that a fetus is not attacked. What was most surprising, however, was what…
View original post 787 more words
wish I could do this everyday..
Hi prose fans.
Here is a beautiful and poignant little poem from George Elliot.
If you sit down at set of sun
And count the acts that you have done,
And, counting, find
One self-denying deed, one word
That eased the heart of him who heard,
One glance most kind
That fell like sunshine where it went —
Then you may count that day well spent.
But if, through all the livelong day,
You’ve cheered no heart, by yea or nay —
If, through it all
You’ve nothing done that you can trace
That brought the sunshine to one face–
No act most small
That helped some soul and nothing cost —
Then count that day as worse than lost.
Try to never lose another day.