Crucial to science education is hands-on involvement: showing, not just telling; real experiments and field trips and not just "virtual reality".

I think all countries need to aim to cut the CO2 emissions per person, taking account of externalities like imports and exports.

I think a few hundred years from now we'll start having the 'posthuman' era of different species.

It's becoming clear that in a sense the cosmos provides the only laboratory where sufficiently extreme conditions are ever achieved to test new ideas on particle physics. The energies in the Big Bang were far higher than we can ever achieve on Earth. So by looking at evidence for the Big Bang, and by studying things like neutron stars, we are in effect learning something about fundamental physics.

Scientists surely have a special responsibility. It is their ideas that form the basis of new technology. They should not be indifferent to the fruits of their ideas. They should forgo experiments that are risky or unethical.

To ensure continuing prosperity in the global economy, nothing is more important than the development and application of knowledge and skills.

I recall a lecture by John Glenn, the first American to go into orbit. When asked what went through his mind while he was crouched in the rocket nose-cone, awaiting blast-off, he replied, "I was thinking that the rocket has 20,000 components, and each was made by the lowest bidder."