Stephen Sackur speaks to a scientist of rare distinction. Jocelyn Bell Burnell was a key member of the team which discovered pulsars and neutron stars in the late 1960s. She became one of the world’s most renowned astrophysicists - remarkable for the originality of her research, but also for being one of the few prominent women in her discipline. Throughout her career she's blazed a trail for women in a predominantly male world. Why are there so few women at science's top table?Image: Jocelyn Bell Burnell