![[IOP]](http://images.iop.org/cws/icons/themes/phw/colophon-small.png){kind=icon}
Print edition: December 2007
Features
Where is the centre of the Earth?
The challenges of determining the location and speed of our planet's heart
Quanta
What's hit your mailbox?
Technology gets spooky
Swiss voters become entangled
Maxwell in bronze
Frontiers
Cosmic rays traced to black holes
Sand could shed light on quark–gluon plasma
Semiconductor bends light the wrong way
Bullet-proof nanotubes
Sensors on the brain
News & Analysis
German ion facility gets the go-ahead
India digs deep to regain past glories
UK plans to withdraw from Gemini telescopes
Europe maps out its plans for space exploration
MRI in Europe gets a reprieve
Journal to support astronomy outreach
Physicist takes the helm at top oceanographic institute
IAEA sees bright future for nuclear power
Chinese satellite reaches the Moon
Scotland aims high with space bid
Best universities revealed
Nuclear partnership urged to slow
BAE Systems slips down R&D chart
The caves of cosmic silence
The video revolution made simple
Editorial
Dark passions
Understanding the accelerating universe is almost as difficult as deciding who should gain credit for its discovery
Forum
A dark future for cosmology
Lawrence Krauss on why we will never understand the true nature of dark energy
Critical Point
Feedback
Physics and faith are worth debating
Reviews
Physics books crossword
Creative thinking
A physics chauvinist tackles Islam
Colliding personalities
Adventure with the Hawkings
Live hamsters need not apply
Anyone for doughnuts?
A numbers game
Physicists on the couch
All you never wanted to know
The meaning of mathematics
The heat is on
Careers
The business of medical physics
The rewards and challenges of becoming a medical physicist in industry
Careers and people
Lateral Thoughts
Quiz of the year 2007
Test your knowledge of this year's events in physics