The latest stories from the Science & Environment section of the BBC News web site.
Updated: 32 sec ago
A study from US researchers suggests that friends are more genetically similar than strangers - to the same degree as fourth cousins.
The BBC's Pallab Ghosh reports from a potential spaceport site in north Wales, one of eight aerodromes to be shortlisted in the UK as a base for spaceplane flights.
Designing the inside of a 1,000mph car
A Space Exploration Technologies' Falcon 9 rocket has blasted off from Florida, after a two month delay.
Scores of giant African snails, still alive, have been seized by US customs agents at Los Angeles International Airport.
Is China revolutionising high-speed rail travel?
Astronomer Michael Merrifield says we are 'Pretty close' to finding life outside Earth
A rare bluefin tuna fish has been discovered by group of friends in Kingsand, Cornwall.
A group of kayakers tow a "monster" bluefin tuna fish to a Cornish beach after it is found floating in the sea.
Dolphin attacks on porpoises in Cardigan Bay leave marine scientists scratching their heads.
New Zealand approves mass poisoning to protect native wildlife.
Scientists looking for a new antibiotic are testing Welsh honey samples to see if they can provide a solution.
The UK government wants to establish a spaceport by 2018, with six of the eight potential locations sited in Scotland.
China has publicly admitted permitting the trade in skins from captive tigers, an international convention to protect endangered species hears.
A nature reserve becomes a stronghold for two rare butterflies, a wildlife trust says.
Scientists argue over the merits of a review which concludes that organic foods have higher levels of antioxidants and lower levels of pesticide residues.
Is there any science behind Planet of the Apes?
People in Guernsey are being warned to be careful on the beach after blue jellyfish were spotted off the coast.
A child born in the US with HIV and believed cured after very early treatment has now been found to still harbour the virus, doctors say.
The air quality in some of the UK's biggest cities is unlikely to meet EU standards before 2030 according to the government.