Your Dog’s Breed Doesn’t Always Determine How They’ll Behave The dog world abounds with stereotypes about the personalities of different breeds. The American Kennel Club describes chihuahuas as “sassy,” and malamutes as “loyal,” while breed-specific legislation in many cities target breeds like pit bulls as stereotypically aggressive. But do these stereotypes say anything true about a dog’s personality and behaviors? New research in the journal Science looked at the genomes of thousands of dogs, both purebred and mutt, plus owner reports on personality traits. And their findings were more complicated: Yes, many behaviors have a genetic or heritable component. But breed, it turns out, may be a poor predictor of many things, including aggression or friendliness. Guest host Umair Irfan talks to co-author Elinor Karlsson about the complexities of genetics, personality, and breed in our best friends.   Life At The Poles Is Changing. What Do These Frozen Regions Forecast? It’s been a spring of alarming headlines for the coldest climates on Earth, from record heat waves at both poles, to a never-before-seen ice shelf collapse in East Antarctica. But what can we say for sure about how the Arctic and Antarctic are changing under global warming? In this Zoom taping, guest host Umair Irfan talks to two scientists, Arctic climate researcher Uma Bhatt and Antarctic biological oceanographer Oscar Schofield, about the changes they’re seeing on the ice and in the water, and the complex but different ecologies of both these regions. Plus, answering listener questions about the warming polar regions.   Can Hydrogen-Fuel Cells Drive The Car Market? If you’ve been shopping for a new car recently, you may have been struck by the number of electric vehicles available from different manufacturers. According to Kelley Blue book data, Americans bought almost twice as many EVs in the first quarter of 2022 compared to the first quarter of 2021, with battery-powered electric vehicles reaching 5% of the new car market for the first time. But electric isn’t the only alternative to the traditional gasoline or diesel powered car—there are also hydrogen fuel cell car options, such as the Mirai, a hydrogen fuel cell car from Toyota. In those vehicles, compressed hydrogen is used in conjunction with a catalytic fuel cell membrane to generate the electricity to drive the vehicle. Cars using the technology can have a 300-mile range, with fuel-ups taking as little as five minutes. And while today much of that hydrogen comes from fossil fuels, there is the potential for it to come from electrolysis of water via renewable energy, such as solar or wind. But there are big technological and infrastructure challenges to solve before fuel cell technology could compete with the battery-powered electric car. Joan Ogden, a professor emeritus of environmental science and policy at UC Davis, joins Umair Irfan to talk about the requirements for building the refueling infrastructure that would make fuel cell vehicles a more attractive option to consumers.   Is It Possible To Decarbonize Shipping? It’s said that 90% of all goods at some point travel on a ship. Much of that transportation is on container ships, gargantuan vessels that carry thousands of the 20-foot or 40-foot shipping containers that serve as the foundation of the global economy. But those big cargo ships have a massive energy appetite, and the “bunker oil” fuel they devour is notoriously dirty. If the global shipping industry was a country, it would be the sixth-largest greenhouse gas emitting country in the world. Lee Kindberg, head of environment and sustainability for North America for the shipping giant Maersk, joins Umair Irfan to talk about the company’s efforts to reduce its carbon footprint. Maersk recently placed an order for a dozen methanol-fueled cargo ships, the first of which it plans to launch next year.   Transcripts for each segment will be available the week after the show airs on sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.