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Print edition: September 2009

Features

Engineering the climate

Geoengineering has so far been something of a taboo topic for climate scientists. Peter Cox and Hazel Jeffery explain why it is now time to take it seriously

Less reality, more security

New results in quantum cryptography show that the original protocol based on Bell's inequality is so powerful that it extends beyond the quantum realm. Artur Ekert traces it all back to Einstein's insights about physical reality

Of gluons, atoms and strings

An unusual alliance between physicists who study ultrahot plasmas and ultracold atoms is yielding intriguing results – and may even lead to an experimental test for string theory, as Barbara Jacak reveals

Quanta

Rap riposte

Taik no chances

Launch your own space kit

An amazing tribute

Frontiers

Stepping up to quantum computing

The flaw in Planck's law

New-found order in the valleys

Fish swish the oceans

Singing oven SCOREs in the developing world

News & Analysis

Beleaguered LHC gears up for restart

Europe unveils plans for UK space base

Renewable energy boosted by US stimulus cash

Nortel sheds staff as bankruptcy bites

Spain opens world's largest telescope

Giant facilities edge closer to reality

Changes needed at European council

Portugal opens novel nanotech lab

Focused papers get more citations

Hawking receives top US award at White House

Free audio archive brings legends to life

Voyager heads for interstellar space

The neutrino hunter

Row bubbles up over particle prize

Editorial

Plan B for climate change

Techniques to manipulate the Earth's climate are now rightly entering mainstream debate

Forum

Illuminating physics for students

David Griffiths says that the role of a physics teacher should be to illuminate the subject's intrinsic interest, beauty and power – and warns that attempts to make it more marketable using gimmicks, false advertising or dilution are bound to be counterproductive

Critical Point

Your best unit

Robert P Crease discusses the origin of some units of measurement, and asks for your favourites

Feedback

Medical imaging at risk from European directive

Caught CAT-napping

Remembering Salam

Comments from physicsworld.com

Language lore

Last call for units

Reviews

Dreams of a quantum pioneer

Gino Segrè looks at the relationship between Pauli and Jung

Web life: Sixty Symbols

Video clips of top physics symbols

Unsolved mysteries of the universe

Astronomy dominates

Puzzling physics

A new time machine

All hail the telescope

Careers

A physicist's life-cycle

Long-term career satisfaction for academics is closely linked to the type of institution where they work, as Joseph C Hermanowicz discovered when he set out to follow physicists through their careers

Once a physicist: Subramaniam Ramadorai

The chief executive of Tata Consultancy Services

Careers and people

Lateral Thoughts

Schrödinger’s dog