The conference is designed to be a showcase of sorts for the latest and quirkiest technology in the fields of machine learning, automation, robotics and space — hence the name, MARS. It's an annual reminder of Bezos' passion for cutting-edge tech, as the founder races toward commercial space travel.
You might remember last year's conference, when Bezos made headlines for taking a walk with a robotic dog made by Boston Dynamics.
The conference is so exclusive that the press isn't allowed in and tweets offer the only inside look. Here's some highlights, posted by attendees: