An estimated three million shipwrecks lay undiscovered. UNESCO is calling for a global treaty to protect them. Salvors say it is unrealistic and unworkable, despite developments in deep-sea exploration technology

Clare Henry saw the latest high-tech astronomical display at in New York and says scientists have taken art to new heights

Revolutionary non-contact cleaning method to be unveiled this month at Liverpool’s laser conservation conference

To dig or not to dig?

Astonishing science and technology show from Peking

British scientists describe the new techniques which could be used to investigate the recently revealed gold and silver hoard