The fortune 500: seven decades of "day one" companies -- How to know when your CEO should go -- After a stroke at 34, $4 billion startup founder Rechel Romer navigates her next chapter -- How waymo steered to the front of the pack and made self-driving taxis a reality -- Super micro rides the al wave to a fortune 500 debut -- Sillicon Valley startups are invading the military market -- The best game plan for your brain as you age -- Aviation stocks are a bargain. Are they worth the turbulence? -- Blurring the lines of fitness and luxury amid the sci-fi glitz of Dubai -- 70 years in the fortune 500 time machine -- Walmart's Mr. Fix-it -- The ever vigilant Satya Nadella -- Meet the class of 1955 -- Where corporate America hets its history lessons -- The death of the American pharmacy -- A disastrous hack -- Inside the cult of costco -- Assassing the global outlook is a risky business.