More than 31 million Americans (12%) report needing to borrow about $74 billion last year to pay for healthcare despite most having some form of health insurance, according to a new survey from West Health and Gallup. Nearly one-third (28%) report being “very concerned” that a major health event could throw them into debt.

Building on a previous study that supported the ancient philosopher Plato’s conjecture—that Earth is mostly made from cubes—geophysicist Douglas Jerolmack of the University of Pennsylvania teamed up with longtime collaborator, mathematician Gábor Domokos of Budapest University of Technology and Economics, to use their framework for understanding fracture patterns on Earth to survey fracture networks across the solar system. Their findings could offer insights into detecting potentially habitable environments on other planets.