Named after a form of South American stone hill fortress, the Pucara's origins can be traced back to the mid-1960's when Argentina's Fabrica Militar de Aviones (Military Aircraft Factory ...

That exercise is taking place after Finland accused Moscow of using its military aircraft to violate Finnish airspace. 14:45:01 'We have to prepare': German chancellor warns of prolonged war ...

China is expected to expand its submarine force from 60 boats to 65 by this year and 80 by a decade later.

Discover world-changing science. Explore our digital archive back to 1845, including articles by more than 150 Nobel Prize winners.