The source of Energy
06月 3rd, 2011A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun's very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is librated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium, and in doing so, release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of year.
the nuclear energy is released at the Sun's center as high-energy gamma radiation, a form of electromagnetic radiation like light and radio waves, only of very much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun to be reemitted at slightly longer wavelengths. This radiation , in its turn is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small fraction of the Sun's light and heat is emitted in such directions that after passing unhindered through interplanetary space, it hits the Earth.
I'm not a little girl anymore
05月 5th, 2011
Night after night, she came to tuck me in, even long after my childhood years. Following her longstanding custom, she'd lean down and push my long hair out of the way, then kiss my forehead.
I don't remember when it first started annoying me — her hands pushing my hair that way. But it did annoy me, for they felt work-worn and rough against my young skin. Finally, one night, I shouted out at her, "Don't do that anymore —your hands are too rough!" She didn't say anything in reply. But never again did my mother close out my day with that familiar expression of her love.
Time after time, with the passing years, my thoughts returned to that night. By then I missed my mother's hands, missed her goodnight kiss on my forehead. Sometimes the incident seemed very close, sometimes far away. But always it lurked, in the back of my mind.
Well, the years have passed, and I'm not a little girl anymore. Mom is in her mid-seventies, and those hands I once thought to be so rough are still doing things for me and my family. She's been our doctor, reaching into a medicine cabinet for the remedy to calm a young girl's stomach or soothe the boy's scraped knee. She cooks the best fried chicken in the world... gets stains out of blue jeans like I never could...
Now, my own children are grown and gone. Mom no longer has Dad, and on special occasions, I find myself drawn next door to spend the night with her. So it was late on Thanksgiving Eve, as I slept in the bedroom of my youth, a familiar hand hesitantly run across my face to brush the hair from my forehead. Then a kiss, ever so gently, touched my brow.
In my memory, for the thousandth time, I recalled the night my young voice complained, "Don't do that anymore — your hands are too rough!" Catching Mom's hand in hand, I blurted out how sorry I was for that night. I thought she'd remember, as I did. But Mom didn't know what I was talking about. She had forgotten — and forgiven — long ago.
That night, I fell asleep with a new appreciation for my gentle mother and her caring hands. And the guilt that I had carried around for so long was nowhere to be found.
five hundred times
04月 22nd, 2011
In the traffic court of a large mid-western city, a young lady was brought before the judge to answer a ticket given her for driving through a red light. She explained to his honor that she was a school teacher and requested an immediate disposal of her case in order that she might hasten on to her classes. A wild gleam came into the judge's eye. "You are a school teacher, eh?" said he. "Madam, I shall realize my lifelong ambition. Sit down at that table and write 'I went through a red light' five hundred times."