Main content
What is a 'normal' period?
Professor Hilary Critchley reveals how much blood is usually lost during a period.
Duration:
This clip is from
More clips from Brainwaves
-
![]()
Faecal transplants
Duration: 03:17
-
![]()
What causes postnatal PTSD?
Duration: 02:00
-
![]()
Key findings from an extraordinary study
Duration: 03:17
-
![]()
Veg Bread
Duration: 23:32
