Investigators hired by Amazon CEO Jeff Bezos claimed last week that his phone was hacked by Saudi Arabia. WSJ's Justin Scheck and Michael Siconolfi explain the history of leaks of Bezos's texts, and how Bezos and Saudi Crown Prince Mohammed bin Salman became archenemies.

270 people were killed when a dam owned by the mining giant Vale collapsed. After a year-long investigation, WSJ's Samantha Pearson and Luciana Magalhaes explain the negligence and coverup inside one of Brazil's biggest companies.

Tesla's stock has been on a tear since late last year, and this week the company's valuation reached $100 billion. Investors who believe in the stock couldn't be happier. But others think the company is overvalued. WSJ's Gunjan Banerji explains the divide.