He's so knowledgeable

My husband is a voracious reader and has a lot of knowledge about a lot of subjects. I tease him sometimes and call him Mr. Know-It-All.

When I am conversing (!) with our children, I'll refer to him as "KIA" for short.
My issue du jour is that I want him to start blogging. He has many interests, from aviation and cars to cooking and music. He also loves reading about the history of state and interstate highways and byways, turnpikes, parkways and the like.
Go figure.

How do I get him to take the plunge into the blogosphere? Any suggestions?