Bill Gates says marrying Melinda is the best decision he ever made. The world’s richest man can spend his money on anything, but he says he stays away from buying clothes or jewelry for himself.

“I do like to buy nice things for my wife,” Bill Gates wrote on Reddit on Tuesday. After all, he said marrying her is the best decision of his life.

The billionaire, philanthropist and Microsoft (MSFT, Tech30) founder took an hour out of his day to host his fourth AMA — a mix of very serious and sometimes silly questions.

He was asked about everything from artificial intelligence and the Apple encryption debate, to education and his fastest time on Minesweeper.

The live chat generated more than 7,000 comments.

Here are a few of the most interesting questions and answers, shortened for brevity.

“Would you consider marrying Melinda to be one of the top three decisions of your life?”

You are correct! I would put it at the top. Deciding to work on software was a good decision but that just crept up on me rather than being some choice.

bill melinda gates
Bill Gates spent an hour responding to questions on Reddit for his fourth AMA. He said marrying his wife Melinda is the best decision of his life.