(IMAGE) McGill University Caption By playing Borderlands Science, a mini-game within the looter-shooter video game Borderlands 3, 4.5 million gamers have helped trace the evolutionary relationships of more than a million different kinds of bacteria that live in the human gut. Credit Gearbox Usage Restrictions Credit source License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.