A spider web is a complex and beautiful thing. It is also functional. Spider webs have evolved through natural selection. That means that random changes in genes have been passed on to later generations. Spiders, like all animals and adaptations, have evolved over millions of years and spider webs have existed for at least 100 million years (based on examples found in amber specimens).
Mid-1800s Czechoslovakia: My ancestors are still considering
birthing my grandparents; Friar Johann Gregor Mendel
experiments on his 28,000 edible pea plants.
Each develops their own theory of inheritance.
People, plants and the recombination of genes.
Encouraged by rain, mushrooms in my backyard.
A field guide identifies them as Amanita rubescens,
edible, but easily confused with poisonous species.
Cowardly avoided, even with this scientific information,
I watch a chipmunk nibble it away.
Some of the Shiloh soldiers sat in the mud for two rainy days and nights waiting for the medics to get around to them. As dusk fell the first night, some of them noticed something very strange: their wounds were glowing, casting a faint light into the darkness of the battlefield. Even stranger, when the troops were eventually moved to field hospitals, those whose wounds glowed had a better survival rate and had their wounds heal more quickly and cleanly than their unilluminated brothers-in-arms. The seemingly protective effect of the mysterious light earned it the nickname “Angel’s Glow.”
Why? read more
The Hoyo Negro skull underwater Photo Credit: Paul Nicklen/National Geographic.
A skeleton, known as the Hoyo Negro (Black Hole) skeleton, is the most complete Paleoamerican remains known. It was found in 2007 by three divers exploring a Mexican cave.
It helps researchers get closer to understanding who the early “Americans” were and where they came from.
When I took archaeology and anthropology…
illustration from Stephen Greenblatt’s piece in The New Yorker about Lucretius
this twenty-first century morning makes me
a Roman meditating a thousand years ago
On the Nature of Things, a universe
Ghost heart image by Doris Taylor
Right now, more than 3,200 people are on the waiting list for a heart transplant in the United States. And other s are hoping for replacement kidneys, livers, lungs, and pancreases. We need spare parts.
Some of those waiting won’t make it, because an appropriate match won’t be available in time. Some will get a transplant, but it will be rejected by their body.…
That grew at incredible pace
Now close observation
Reveals this inflation
Has left an indelible trace."
I am looking forward to watching Cosmos: A Spacetime Odyssey - the relaunch of Carl Sagan’s classic “Cosmos: A Personal Voyage.”
The show is hosted by astrophysicist Neil deGrasse Tyson.
Cosmos premieres Sunday (March 9) on FOX, and Monday (March 10) on the National Geographic Channel.
There was no New Moon this month, but there will be two in March – on the 1st and the 30th.
I have seen some websites call the New Moon a Black Moon. That is not an astronomical term but the name is understandable since the Moon is not normally visible at this phase (except when it is seen in silhouette during a solar eclipse).
I never lose sleep worrying about light. Is it a particle or a wave? It has a very lovely split personality.
What is going on on Mars during certain times of the year when dark streaks are appearing? Scientists baffled. It isn’t water. It contains iron.
sci-universe: These footprints, found on England’s eastern coast, are more than 780,000 years old. They are the earliest human footprints that have been found outside of Africa.