Misc: This animal is armed with bony plates & rolls up into a ball if frightened?

Questions

Who in the 20th century is credited with building the first successful helicopter, which flew in 1939?

Leatherjackets are the larvae of which insect?

Who was Poet Laureate from 1843 to 1850, during which period he wrote no poetry at all?

Which Danish word means 'play well'?

Which independent family company is Britain's oldest brewer, having been brewing on the site in Faversham since 1698?