What's the Kennection? #359

Which car company released the Thunderbird in 1954, to compete with the successful Corvette?

What plants of genus Urtica are often used to make soups or pestos, since cooking them removes their “stinging” properties?

What layer of the Earth, between crust and core, makes up about 84% of the planet’s volume?

What’s the name of Niles’s unseen first wife on Frasier?

In which book of the Bible does Naomi say, “Whither thou goest, I will go”?

What's the "Kennection"?