Sports&Games: What is the Chess ranking system called ?

Questions

Name of the indigenous people of Jamaica?

Which Derbyshire born aeronautical engineer designed the R100 airship,the bouncing bomb and the first swing wing aircraft?

hans Lippershay -1608, Galileo - 1610, Isaac Newton - 1668 and William Herschel 178 all designed different types of what?

Who was the first engineer to introduce steam to an engine with a piston?

Who invented the aqualung while fighting with the French Resistance during the secomd world war?