Mosquito pesticide failing

Mosquito pesticide failing - prevention of dengue fever and other diseases at risk.
Dangerous bird flu evolving fast - researchers are learning why bird flu is persisting and spreading fast round the world, and assess the threat to humans.
Drilling for ancient ice in the Antarctic - Roland talks to one of the team drilling kilometres into an ancient, frozen record of past climate,
Martian rock store opens - NASA's Mars Perseverance rover is stashing rock samples future missions could bring back to Earth.

Image credit: Shinji Kasai

Producer: Roland Pease
Assistant Producer: Sophie Ormiston