T H E I N T E R N AT I O N A L W E E K LY J O U R N A L O F S C I E N C E EXTREME CHEMISTRY Experiments on rare lawrencium atoms illuminate a relativistic region of the periodic table PAGES 166 & 209 RESEARCH CAREERS BIOINFORMATICS ARCTIC PERMAFROST POSTDOC OF THE FUTURE BIOLOGY BY THE NUMBERS COLD COMFORT Why permadocs must become superdocs PAGE 144 Cover 9 April 2015.indd 1 Data analyis is undervalued in the life sciences PAGE 151 NATURE.COM/NATURE 9 April 2015 £10 Vol. 520, No. 7546 Green-house gas release may be slow but prolonged PAGE 171 02/04/2015 11:26 520, 127–258 9 APRIL 2015 NATURE.COM/NATURE NO. 7546