Biology Quotes
Sometimes our body`s signals get messed up and our failsafe goes haywire. Instead of making clots, our body destroys them. And the thing that`s supposed to help us only hurts us. It means we start to bleed and everything shuts down.
It has been said that man is a rational animal. All my life I have been searching for evidence which could support this.
Instinct is a marvellous thing, [...] It can neither be explained nor ignored.
Every living thing is, from the cosmic perspective, incredibly lucky simply to be alive. Most, 90 percent and more, of all the organisms that have ever lived have died without viable offspring, but not a single one of your ancestors, going back to the dawn of life on Earth, suffered that normal misfortune. You spring from an unbroken line of winners going back millions of generations, and those winners were, in every generation, the luckiest of the lucky, one out of a thousand or even a million. So however unlucky you may be on some occasion today, your presence on the planet testifies to the role luck has played in your past.
You can never pinpoint the exact moment that a species came to be, because it never did. Just like how you used to be a baby and now you're older, but there was no single day when you went to bed young and woke up old. (...) There was no first human. It sounds like a paradox, it sounds like it breaks the whole theory of evolution, but it's really a key to truly understanding how evolution works. Evolution happens like a movie, with frames moving by both quickly and gradually, and we often can't see the change while it's occurring. Every time we find a fossil, it's a snapshot back in time, often with thousands of frames missing in between, and we're forced to reconstruct the whole film. Life is what happens in between the snapshots. Instead of a nice smooth road this is a journey on stepping stones and we give each one their own name.
We are going to die, and that makes us the lucky ones. Most people are never going to die because they are never going to be born. The potential people who could have been here in my place but who will in fact never see the light of day outnumber the sand grains of Arabia. Certainly those unborn ghosts include greater poets than Keats, scientists greater than Newton. We know this because the set of possible people allowed by our DNA so massively outnumbers the set of actual people. In the teeth of these stupefying odds it is you and I, in our ordinariness, that are here.
I regard the brain as a computer which will stop working when its components fail. There is no heaven or afterlife for broken down computers; that is a fairy story for people afraid of the dark.
Species evolve only to meet the pressures of new environments. In a stable environment, a species may remain unchanged for millions of Centuries. Primitive man evolved rapidly because his environment was a harsh and changing one. Once, however, mankind learned to create his own environment, he created a pleasant and stable one, so he just naturally stopped evolving.
It is estimated that well over 99 percent of all the organisms that have ever lived have died without having had offspring. And yet here you are: of all your billions of ancestors over the years, from single cells to worms to fish to reptiles to mammals to primates, not a single one of them died childless. How lucky you are! Of course every blade of grass has an equally long and proud heritage, and every mosquito, and every elephant and every daisy.
For a biologist the alternative to thinking in evolutionary terms is not to think at all.
Natural selection is a mechanism for generating an exceedingly high degree of improbability.