Hot to Cold

We admire the ornamental beauty of flowers in a garden, but those blooms are more than lush color. The seemingly fragile, delicate petals are part of a resilient, adaptive innovation that arrived on the scene 250 million years ago and transformed life on the planet. Much life, including us, would not have evolved without flowering planets. Yet the power of the petal is often overlooked. How does our perspective on nature’s web change if we give flowers the credit they deserve? Celebrated biologist David Haskell shares the story of how nature’s revolutionaries evolved their vibrant hues and intoxicating scents to lure bees, butterflies and other animals into cooperative partnerships.

Breakthroughs around the detection of cosmic neutrinos — the “ghost” particles that may reveal why matter, not antimatter, fills the universe — recently earned a physicist the Nobel Prize in Physics. But one group of neutrino hunters isn’t waiting for supernovae to churn up these high-energy particles. A massive new experiment that spans three states will create neutrinos and fire them into liquid argon to better understand their mysterious behavior. And after the better part of a century, scientists may finally have glimpsed the primary component of nearly all matter: dark matter. Are we close to understanding what it is? Finally, we glimpse the proton-smashing at the Large Hadron Collider as it hints at undiscovered physics and puts a stress test on the Standard Model.

A growing online movement of sunscreen skeptics believes that sunblock is toxic, even suggesting that it might cause skin cancer. Medical experts, concerned by rising skin cancer rates, are rushing to push back against these claims. Meanwhile, new research suggests that too little sunlight could be detrimental to health and links it to some cardiovascular disease and cancer. How do we navigate through the darkness of these seemingly conflicting messages about sunlight? We enter the slippery world of skin care to break down the science of sunlight and sunscreen and uncover some surprising effects that UV rays have on our bodies.

Healthy rivers and riparian ecosystems are teaming with life, but should rivers themselves be considered alive? The question is central to the growing rights-of-nature movement that claims that ecosystems and entities, like rivers, have legal rights. After Ecuador enshrined the rights of nature in its constitution, lawyers employed the new personhood status to stop mining companies from clearing a section of the Los Cedros River and its surrounding biodiverse cloud forest. Granting rivers moral standing comes as over-damming, pollution, and climate change have put them in crisis globally. Writer Robert Macfarlane explores how seeing rivers as living beings rather than just resources – a change he calls “a great act of moral imagination” – could help save our watersheds and rivers, upon which all life depends.  

Extreme heat is taking its toll on the natural world. We use words like “heat domes” and “freakish” to describe our everyday existence. These high temperatures aren’t only uncomfortable - they are lethal to humans, animals, and crops. In search of an answer to our episode’s question, we discuss the dilemma of an ever-hotter world with an author who has covered climate change for more than twenty years.