(CNN) President Donald Trump has repeatedly expressed interest in recent weeks in buying Greenland.

That is not a sentence from an Onion article, although you could be forgiven if you made that mistake. This President, the most unorthodox resident of the White House in modern history, is actually, apparently, interested in buying Greenland -- the world's largest island currently owned by Denmark.

This raises all sort of questions -- like, literally, dozens -- but I've boiled it down to five key ones, which I will now attempt to answer.

1. Why?

It makes sense to get the big one out of the way first, right? Why would the US President want to purchase an island that is 80% covered by an ice sheet and where less than 60,000 people actually live? Trump himself hasn't said -- yet -- but there are a few obvious reasons.