May-Britt Moser, a Nobel Prize-winning neuroscience professor, uncovered one of the biggest mysteries of the human brain: how we navigate from one place to another and know exactly where we are. She and her husband, Edvard Moser, made a groundbreaking discovery in 2005, when they found a type of cell near the hippocampus that plays a crucial role in determining our position in space. These cells, known as grid cells, form a coordinate system that activates when a rat passes certain points in space, allowing us to orient ourselves. Their discovery of the brain's "inner GPS" was recognized with the prestigious 2014 Nobel Prize in Physiology or Medicine, cementing their place in scientific history.