Misc: how many inches thick is a hockey puck?

Questions

Which Scottish chemist and physicist invented the vacuum flask?

Before he carved the heads at Mount Rushmore, who had the sculptor been asked to carve into Stone Mountain in Georgia?

Who carved the heads at Mount Rushmore?

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?