Go Ahead, Dive Inside The Mind Of Bill Gates. But Strap In.

There are some things about Bill Gates that are unremarkable.

His favorite food: hamburgers. His favorite animal: the dog. But a few minutes into a new TV series on Gates reveals a fascinating insight.

The Microsoft co-founder and billionaire philanthropist are asked what his worst fear is. It’s not a family tragedy or personal pain. “I don’t want my brain to stop working,” he responds.

That formidable gray matter is fittingly the subject of “Inside Bill’s Brain: Decoding Bill Gates,” a new three-part documentary on Netflix from Academy Award-winning director Davis Guggenheim. It starts Sept. 20.

A portrait emerges of a visionary who gnaws on his eyeglasses’ arms, downs Cokes and is relentlessly optimistic that technology can solve social ills. He is also someone who reads manically — he’ll scrutinize the Minnesota state budget for fun — and who is a wicked opponent at cards.

While the series is largely sympathetic toward its subject, Guggenheim nevertheless presses Gates on everything from the federal antitrust case against Microsoft in the 1990s to his relationship with his mother.

In a phone interview, Gates acknowledged that he balanced the camera’s intrusion with the chance to tell the world — and recruit help — about his efforts to help the planet and the poor.