A species of bee that was reintroduced to the UK after becoming extinct nests in the country for the first time in a quarter of a century.

Going on a health kick reverses ageing at the cellular level, claim US researchers who have been studying people's DNA.

UK cosmologist Prof Stephen Hawking has publicly said he backs the notion of assisted suicide for people with terminal illnesses.

International scientists have mapped the genomes of the tiger, lion and snow leopard, in conservation efforts to protect endangered species.