music: 60's Chart Toppers: Name The Artist: Stop and Think it Over?

Questions

What does the Bessemer process do?

Whose case did Charles VII reopen in 1455, 24 years after she had been sentenced to death?

In which sport do you find hazard chases, a grille and a winning gallery?

What is the real name of Boy George?

In which branch of maths do you get the result of zero when you add the sides of a triangle?