I wouldnt be here today if it were not for the NHS, I have received a large amount of high-quality treatment without which I would not have survived.

Equations are just the boring part of mathematics. I attempt to see things in terms of geometry.

It is tribute to how far we have come in theoretical physics that it now takes enormous machines and a great deal of money to perform experiments whose results we can not predict.

If the total energy of the universe must always remain zero, and it costs energy to create a body, how can a whole universe be created from nothing?

Chaos, when left alone, tends to multiply.

There is no unique picture of reality.

One might think this means that imaginary numbers are just a mathematical game having nothing to do with the real world. From the viewpoint of positivist philosophy, however, one cannot determine what is real. All one can do is find which mathematical models describe the universe we live in. It turns out that a mathematical model involving imaginary time predicts not only effects we have already observed but also effects we have not been able to measure yet nevertheless believe in for other reasons. So what is real and what is imaginary? Is the distinction just in our minds?