When it was suggested to Pasteur that many of his great achievements depended on luck, he replied - I'm sure with more than a little irritation - 'In the field of observation in science, fortune only favours the prepared mind.' It is not by chance that it is always the great scientists who have the luck.

I regard it as ethically unacceptable and impractical to censor any aspect of trying to understand the nature of our world.

It is not birth, marriage, or death, but gastrulation which is truly the most important time in your life.

Both Newton and Darwin were driven by the data and were forced to recognize that they couldn't explain everything. It may be a characteristic of great scientists to know what to accept and what to leave out.

Depression is sadness gone wrong

I strongly hold that, if an idea fits with common sense, then scientifically it is almost certain to be false.

There is zero evidence for god.