A year after the Titan submersible imploded, killing five people, an Ohio real estate investor aims to prove that exploring Titanic-level depths is safe.
Elon Musk has amassed a fortune. His net worth hovers around $200 billion. But because the majority of his wealth is tied to Tesla shares and stock options, it dips and rises every day. See how he became one of the world's richest people — and where he spends his money.