Table of Contents

There is nothing outside the universe 17

In the future we shall know more 26

Many observers not many worlds 33

The universe is made of processes not things 49

What we have learned 67

Black holes and hidden regions 69

Acceleration and heat 77

Black holes are hot 88

Area and information 95

How to count space 106

Knots links and kinks 125

The sound of space is a string 146

The present frontiers 167

The holographic principle 169

How to weave a string 179

What chooses the laws of nature? 194

A possible future 207

Postscript 212

Glossary 226

Suggestions for further reading 235

Index 241