18:00Six O'Clock News11/02/16 Scientific breakthrough heralded.BBC Radio 4 Duration: 30 minutes Thu 11th Feb 2016, 18:00 on BBC Radio 4 LWAvailable for over a yearListen nowGravitational waves detected. Jeremy Hunt to impose a new contract on junior doctorsGenresNewsFormatsBulletinsBrandSix O'Clock News Source: BBC Online