February 2005

• Engineers devise invisibility shield - Premium content

  Electron effects could stop objects from scattering light.

  28 February 2005

• Countries reject global mercury treaty - Premium content

  UN meeting decides on voluntary actions rather than export bans.

  28 February 2005

• Female eggs grown in male testes - Premium content

  Study gives clue to how genes and environment create sex cells.

  28 February 2005

• Radio collars stress vulnerable voles - Premium content

  Ecologists tracking species may be doing more harm than good.

  28 February 2005

• Formaldehyde claim inflames martian debate - Premium content

  Top scientist defends data that he says point strongly to life on Mars.

  25 February 2005

• Britain baulks at funding safety research - Premium content

  Chance to gain trust for nanotechnology may be lost, warn scientists.

  25 February 2005

• Treaty triumphs against tobacco - Premium content

  Global convention gets swift ratification, but countries will need support.

  25 February 2005

• Teams solve structure of key HIV proteins - Premium content

  Double discovery should help designs for effective vaccines.

  25 February 2005

• Perchlorate found in breast milk - Premium content

  Discovery fuels debate over pollution from rocket launches.

  24 February 2005

• Martian pole reveals ice age cycles - Premium content

  Climate record seen in Red Planet's exposed ice cliffs.

  24 February 2005