However, closer examination revealed differences between men and women in two key components of the immune system - T-cells, which protect the body from infection, and B-cells, which secrete antibodies.

BBC: Biological clue to why women live longer than men

Beta blockers work by reducing activity in the sympathetic nervous system, which is one of the two major branches of the body's stress (or fight-and-flight) system.

CNN: Have you heard of a heart drug that also helps PTSD?

The Met's founders wanted to create a democratic body that was "in tune with the people" and so deliberately avoided the two-tier system of recruitment that existed in the army.

BBC: What do bobbies learn on the beat?

The new body will initially conduct two reviews - the first looking at all 400 tax reliefs, allowances and exemptions in the system to see how they can be streamlined, and the second finding ways to simplify the tax system for small businesses, including finding a simpler alternative to the controversial IR35 code.

BBC: Tax system 'to be simplified to encourage investment'