14 APR 2012 by ideonexus
The Journey of a Fossil
One hundred million years ago, an ammonoid lived in the sea that then separated India from Asia. It died and fell into limy sediments on the seafloor. These sediments grew deeper and hardened into rock. The shell calcified, becoming part of the rock, though maintaining every detail of its structure. India was on the move, drifting on a slab of the Earth's mobile crust toward Asia. The floor of the intervening sea was forced under the Asian continent, back into the hot interior of the planet. ...
1 Chet Raymo describes the epic journey of a fossil from the bottom of the ocean to the top of a mountain.
14 APR 2012 by ideonexus
The Zodiacal Light
The zodiacal light is caused by sunlight reflecting from meteoric dust that orbits the sun in the plane of the solar system, remnants of the vast nebula of dust and gas out of which the solar system was born more than four billion years ago. Like the planets, this diffuse stream of particles reflects light, although faintly and rarely seen. Moonless nights of winter are the best time to see the zodiacal light. and nowhere better than here, on the Tropic of Cancer, where the plane of the solar... 1 
notes
notesChet Raymo describes seeing the light of our planetary disk of our solar system intersecting the light of the milky way galaxy.
14 APR 2012 by ideonexus
Petitionary Prayer
I was raised in a culture of petition, inculcated from an early age with a repertoire of formulaic prayers addressed to God, his angels, or his saints. All of the prayers assumed a response: Here I am, Lord, deserving of your attention, favor, heating, forgiveness. Never did it pass my mind that my prayers were not heard. My education was hemmed about with a huge body of stories affirming God's intervention in human affairs. Had not every religious person experienced firsthand the power of pr... 1 notes
notesChet Raymo describes his experiences with prayer and reevaluating it after encountering science later in life.
05 JAN 2012 by ideonexus
Mathematical Proof that an Arm's Length of DNA is in Ever...
We know from X-ray diffraction studies that a strand of DNA is 1.5 nanometers (1.5 x 10 to the -9 meters) in radius. Assume a cylinder 1 meter long (the arm's length) with a radius of 1.5 nanometers and work out the volume (length x pi r-squared). A typical animal cell is about 8 micrometers (8 x 10 to the -6 meters) in radius. Assume a spherical cell and calculate the volume (4/3 pi r-cubed). Do it yourself. You will see that the DNA fits easily inside the cell, with plenty of room for all o...Folksonomies: mathematics dna
Folksonomies: mathematics dna
Chet Raymo does the math to demonstrate this seemingly impossible scientific facts.
24 NOV 2011 by ideonexus
The Molecular Beauty of a Butterfly
When I see the butterfly, I imagine in my mind's eye the extraordinary chemical machinery of life, the winding loom of he DNA, the proteins linking like lock and key, the ceaseless hubbub of molecular commerce that goes on behind the scenes, from egg, to caterpillar, to chrysalis, to adult. Surely, no land of faerie is more magical than the transformation that occurs in the chrysalis, when a creepy-crawly caterpillar curls up in a self-made sack and rearranges its molecules to emerge as a win... 1 notes
notesChet Raymo describes what he sees when he thinks of a butterfly.
08 JUN 2011 by ideonexus
It Takes Numerous Experts to Explore a One-Mile Path
Of course, no one person has the time, knowledge, or skill to learn everything about a landscape, so in my walks 1 have relied upon the labors of generations of botanists, ornithologists, zoologists, geologists, ecologists, meteorologists, astronomers. cultural historians, and a host of other specialists who have studied with particular care some feature of the natural world. Whenever possible, I queried people I met along the way: the old people who grew up in the landscape, who knew it in i...Folksonomies: expertise specialization
Folksonomies: expertise specialization
1 notes
notesChet Raymo lists all the individuals he needed to consult to fully understand the path he walks each day.
