You’ve heard the news that smoking is bad for your health. But it turns out not exercising could be even worse for your chances of survival, according to a recent study in the journal JAMA Network Open. But is it possible to overdo it? While you’re trying to boost your overall health, could you instead be doing damage to your heart? In this segment, Wael Jaber of the Cleveland Clinic and Maia P. Smith of St. George’s University talk about how sports like weightlifting stack up to running and cycling in terms of health effects, and how the sport you choose could actually reshape your heart. Discovered only decades ago, black holes remain one of the universe’s most mysterious objects, with such a strong gravitational pull that  that light—and even data—can’t escape. Oftentimes researchers can only observe black holes indirectly, like from blasts of energy that come from when the massive bodies “feed” on nearby objects. But where is that energy generated, and how does that eating process actually progress through the geometry of the black hole? Erin Kara, a postdoctoral fellow at the University of Maryland and NASA Goddard Space Flight Center, describes new research published in Nature into how echoes of X-rays in small, stellar-mass black holes can point the way. At the other end of the spectrum, supermassive black holes billions of times the mass of our Sun are believed to dwell at the hearts of galaxies. Many are active, drawing in nearby gas and dust and emitting energy in response, but others are dormant, with nothing close to feed on. MIT postdoctoral fellow Dheeraj Pasham talks about what happens when these dormant black holes suddenly encounter and tear apart a star—and how the fallout can shed light on how these black holes spin. His research appeared in Science this week. The researchers also discuss how black holes could lead the way to understanding how galaxies evolve, and other black hole mysteries. Every year, the Consumer Electronics Show, or CES, meets in Las Vegas to showcase the latest in consumer tech trends. This year was no different—but what should we expect in tech in 2019? WIRED news editor Brian Barrett was on the floor of the Las Vegas Convention Center all week and joins Ira to talk about what he saw, including a flying taxi and other concept cars, delivery drones, robot companions, and ‘5G’ products mean without a 5G network.