Engineers finish assembling the telescope that will succeed Hubble. James Webb, as it is known, is now on track to be launched two years from now.

An analysis of national plans to cut carbon says they are still way above the levels needed to keep the rise in global temperatures under 2C.

China has launched its biggest rocket to date - the Long March 5.

Authorities in Florida are releasing sterile flies in a bid to stamp out a flesh-eating livestock disease that has returned to the US for the first time in 30 years.

Ebola dramatically adapted to infect human tissues with ease in the first few months of the Ebola outbreak.