I recently got an interesting email from Numbers Guy reader Michael Gazzolo: "I made a purchase on Amazon.com and checked the tracking info and it claimed to be delivered two years ago to New Jersey ...

That just left the question: why is Amazon tracking such granular data in the first place? It turns out that Amazon has a few answers to that, some more convincing than others. The main feature Amazon ...

Jeff Bezos has a hidden weapon: your data. While Amazon’s retail empire is built on a complex web of infrastructure and murky working practices, its selling success is based on an intricate knowledge ...