Geothermal power stations harness underground heat to generate electricity in volcanically active places such as Iceland. A new approach uses drilling to allow geothermal power to be tapped almost anywhere,greatly expanding its potential as an energy source. But it has several obstacles to overcome‹including its tendency to cause small earthquakes...

Also in this technology quarterly report:

Untangling the social web - What your network of friends can reveal about you

Hot rocks and high hopes - The promise and pitfalls of geothermal power

Rewiring the nervous system - A new technique makes artificial limbs easier to control

Power to the people - How bottom-up models can address the "energy gap"

The virtual curmudgeon - A profile of Jaron Lanier, a sceptical cyber-guru