Whilst behind any unfreindly enemy hold the melee button to perform an assaination. Different assination depend on angles.

Whilst on Salyut 7 space station, Savitskaya became the first woman to perform a space walk on 25th July 1984

He fancied going on holiday and he wrote a poem whilst on holiday in russia and the he got some MIG pilots to perform it...

None. They're slightly different, leading to differences in performance in certain tasks (clasically, women perform better in language, whilst men perform better in mental rotation/maths). However, this could be due to different upbringing.