A good physiological experiment like a good physical one requires that it should present anywhere, at any time, under identical conditions, the same certain and unequivocal phenomena that can always be confirmed.

Nothing is more necessary to the culture of the higher sciences, or of the more elevated departments of science, than meditation; and nothing is less suited to meditation than the structure of democratic society.

The formal scientific definition of theory is quite different from the everyday meaning of the word. It refers to a comprehensive explanation of some aspect of nature that is supported by a vast body of evidence.

If you don't understand how the world works, then everything is a mystery to you. If everything is magical and mysterious, then you really don't work on logic anymore. Then, everything is all about belief.

A blade of grass is a commonplace on Earth; it would be a miracle on Mars. Our descendants on Mars will know the value of a patch of green. And if a blade of grass is priceless, what is the value of a human being?

Science doesn't claim to have absolute certainty about the world; it creates models that provide the best explanation based on the available evidence. If additional evidence is found, the model can be changed.

We can believe in the future and work to achieve it and preserve it, or we can whirl blindly on, behaving as if one day there will be no children to inherit our legacy. The choice is ours; the earth is in balance.

Wherever there is abuse there is also corruption. Politics, philosophy, theology, science, industry, any field with the potential to affect the well-being of others can be destroyed by abuse and saved by good will.

It is often stated that of all the theories proposed in this century, the silliest is quantum theory. In fact, some say that the only thing that quantum theory has going for it is that it is unquestionably correct.

That natural selection can produce changes within a type is disputed by no one, not even the staunchest creationist. But that it can transform one species into another — that, in fact, has never been observed.

The idea that one can go to the fossil record and expect to empirically recover an ancestor-descendant sequence, be it of species, genera, families, or whatever, has been, and continues to be, a pernicious illusion.

espond rather than react to situations, people or environment. Let go of limiting emotions such as fear, frustration and anger and start to express your emotions to others, this is essential to a healthy wellbeing.

Indeed, King Louis XIV of France, confronted with a revised map of his domain based on accurate longitude measurements, reportedly complained that he was losing more territory to his astronomers than to his enemies.

Timmy has no intention of going on the trip. He has never been on a sightseeing tour before and according to him, he is never going on one, end of discussion. Who wants to see a stupid planet called Earth, anyway?

Be sceptical, ask questions, demand proof. Demand evidence. Don't take anything for granted. But here's the thing: When you get proof, you need to accept the proof. And we're not that good at doing that.