Curiosity and the urge to solve problems are the emotional hallmarks of our species.
We began as wanderers, and we are wanderers still.
War is murder writ large.
An organism at war with itself is doomed.
Science ... looks skeptically at all claims to knowledge, old and new. It teaches not blind obedience to those in authority but to vigorous debate, and in many respects that's the secret of its success.
If we are to survive, our loyalties must be broadened further, to include the whole human community, the entire planet Earth.
Atoms are mainly empty space. Matter is composed chiefly of nothing.
We are not smart enough to decide which pieces of knowledge are permissible and which are not.
But I could be wrong.
It's hard to kill a creature once it lets you see its consciousness.
We are rare and precious because we are alive, because we can think as well as we can. We are privileged to influence and perhaps control our future. I believe we have an obligation to fight for life on Earth - not just for ourselves, but for all those, humans and others, who came before us, and to whom we are beholden, and for all those who, if we are wise enough, will come after.
In the deepest sense the search for extraterrestrial intelligence is a search for ourselves.
But, Jefferson worried that the people - and the argument goes back to Thucydides and Aristotle - are easily misled. He also stressed, passionately and repeatedly, that it was essential for the people to understand the risks and benefits of government, to educate themselves, and to involve themselves in the political process. Without that, he said, the wolves will take over.
A millennium before Europeans were willing to divest themselves of the Biblical idea that the world was a few thousand years old, the Mayans were thinking of millions and the Hindus billions.
It's sometimes easier to reject strong evidence than to admit that we've been wrong, this is information about ourselves worth having.
A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.
It's a lazy Saturday afternoon, there's a couple lying naked in bed reading Encyclopediea Brittannica to each other, and arguing about whether the Andromeda Galaxy is more 'numinous' than the Ressurection. Do they know how to have a good time, or don't they?
Our ancestors lived out of doors. They were as familiar with the night sky as most of us are with our favorite television programs.
Not all birds can fly. What separates the flyers from the walkers is the ability to take off.
Some racists still reject the plain testimony written in the DNA that all the races are not only human but nearly indistinguishable. . . .
There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
Even Johannes Kepler, Isaac Newton, Charles Darwin, Gregor Mendel, and Albert Einstein made serious mistakes. But the scientific enterprise arranges things so that teamwork prevails: What one of us, even the most brilliant among us, misses, another of us, even someone much less celebrated and capable, may detect and rectify.
Valid criticism does you a favor.
Writing is perhaps the greatest of human inventions.
There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths.
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