useless trivia: What Word Means: The Edge?

Questions

What units are used to measure the size of pearls?

Which car manufacturer was the first to introduce front wheel drive in 1934?

What is best viewed from two tourist viewpoints - the North Rim and the South Rim?

What is the name of the island that separates the two waterfalls at Niagara?

The Model T Ford was produced from 1909 until 1927. Which revolutionary innovation was introduced in 1913?