时间：2017-05-26 15:02:42本文内容及图片来源于读者投稿,如有侵权请联系xuexila888@ 韦彦
Human vision like that of other primates has evolved in an arboreal environment. In the densecomplex world of a tropical forest, it is more important to see well than to develop an acutesense of smell. In the course of evolution members of the primate line have acquired large eyes while the snout has shrunk to give the eye an unimpeded view.
Of mammals only humans and some primates enjoy color vision. The red flag is black to the bull. Horses live in a monochrome world.Light visible to human eyes however occupies only a very narrow band in the whole electromagnetic spectrum. Ultraviolet rays are invisible to humans though ants and honeybees are sensitive to them. Humans have no direct perception of infrared rays unlike the rattlesnake which has receptors tuned into wavelengths longer than 0.7 micron. The world would look eerily different if human eyes were sensitive to infrared radiation. Then instead of the darkness of night, we would be able to move easily in a strange shadowless world where objects glowed with varying degrees of intensity.
But human eyes excel in other ways. They are in fact remarkably discerning in color gradation. The color sensitivity of normal human vision is rarely surpassed even by sophisticated technical devices.
Before the young man began his studies, he wanted assurance from the Master.
"Can you teach me the goal of human life?"
"I cannot," replied the Master.
"Or at least its meaning?"
"Can you indicate to me the nature of death and of life beyond the grave?"
The young man walked away in scorn. The disciples were dismayed that their Master had been shown up in a poor light.
Said the Master soothingly, "Of what is it to comprehend life's nature and life's meaning if you have never tasted it? I'd rather you ate your pudding than speculated on it."
"Be patient toward all that is unsolved in your heart and try to love the questions themselves... Do not now seek the answers, which cannot be given to you because you will not be able to live them.
And the point is, to live everything. Live the questions now. Perhaps you will then gradually, without noticing it, live along some distant day into the answer." - Rainer Maria Rilke
Someone asked "What's your "secret" to a happy life? What makes your days blissful?" on a forum.
I'm not annoying.Think I've got a higher level of life satisfaction than a lot of my friends. There are four things that I can put my finger on that I think I do a little differently than them (and a lot of people). Hope they bring you some joy!
1. I'm constantly and conscientiously focusing on being grateful for all the amazing and miraculous shit in my life.
My wife is a good human, I work with good people, I'm not sick right now, etc... Looking at the basic, mundane stuff around me and appreciating it really helps me feel like I'm a lucky person.
2. I'm always trying to find compassion for people - *especially* those that are pissing me off in one way or another.
If you don't have compassion, you stop trying to find the truth behind people's actions and usually just chalk up their negative ones to that person being an asshole.
3. Tell people you love them, be generous with your friends.
I don't think people realize until they've lost something or made a truly irrevocable mistake just how much loss hurts, and how much they'd give to just express their love for whatever it was that is now gone.
4. Always ask yourself if you could be wrong, and really be open to it.
Give yourself a break, and don't hold yourself to unreasonable standards on this count: as long as you're looking around your world with an open heart and an open mind, the pure intentions behind anything you're wrong about will shine through.