Fi hotspots, such as the GeoNotes system devised by Per Persson of the Swedish Institute of Computer Science.

ECONOMIST: THE INTERNET: The revenge of geography | The

Roger Nordman from the Swedish SP Technical Institute, who reviewed the EST trials, said domestic heat pumps were already well established in Sweden.

BBC: Heat pumps 'need tighter regulations'

In 2005, a Swedish stem cell biologist at the Karolinska Institute in Stockholm, Jonas Frisen, decided to see if he could date people using the same technique.

NPR: How A-Bomb Testing Changed Our Trees