Searching the web is one of the most revealing things you can do. It shows what you're looking to buy, where you want to go and if you're worried about a weird rash. When you search Google, those searches help power its huge digital advertising networks, which is why you might see skin cream ads for that rash days later, on a totally different website. But do people know how much information they're giving up? And do they care? Molly Wood looks at search engine DuckDuckGo - the “anti-Google” - and growing investment in it. (09/24/18)