The fossil record acts as both a memorial to life’s spectacular possibilities and as a warning to humanity about how fast dominance can become forgotten history, according to our guest, Scottish paleobiologist Dr. Thomas Halliday. Halliday’s research investigates long-term patterns in the fossil record, particularly in mammals. In his magnificent and daring new book Otherlands: A Journey through Earth’s Extinct Worlds, Halliday translates cutting-edge science into vivid portraits of sixteen fossil sites and their inhabitants extending back 550 million years.
“To look at the skull of an extant freshwater crocodile is to read a character description. The buttressed processes and arches evoke Gothic architecture, here resisting not the weight of a cathedral roof but the powerful force of the jaw muscles. The high-set eyes and nostrils speak of low swimming, peering, and breathing just above the water surface; the long series of teeth, pointed but round, and set in a long, sweeping snout, suggest a feeding style of swiping, grabbing and holding prey, suitable for catching slippery fish. The scars of life are there, with fractures sustained knitted together. Lives leave their marks in detailed, reproducible ways.” – Thomas Halliday
In this podcast episode, we speak with Halliday about his travel guide to the history of multicellular life on Earth, the fragility of ecosystems, how entire extinct worlds are reconstructed from remnants in the Earth’s crust, and the importance of realizing that the lives and the worlds that we know were preceded by hundreds of millions of years of other life and other worlds, “simultaneously fabulous yet familiar.”
The rock record of the Earth is “an encyclopedia of the possible, of landscapes that have disappeared,” Halliday writes. “This book is an attempt to bring those landscapes to life once more, to break from the dusty, iron-bound image of extinct organisms or the sensationalized, snarling, theme-park Tyrannosaurus, and to experience the reality of nature as one might today.”
“These laws [of biology] are often very much at odds with our daily behavior,” says Dr. Rob Dunn. “In the context of a world that we’re rapidly changing, they seem actually to be growing in their importance, rather than contracting. And they’re not really a part of our discourse. We tend to get caught up with Elon Musk flinging himself out into space, and not pay attention to the fact that whatever we do in space, the species that we bring with us into space are still going to obey the rules of life that we’ve come to understand here on Earth.” Photo by Amanda Ward.
Humans try hard to control the natural world. We’ve dammed and straightened meandering rivers and filled in wetlands. We’ve transformed primordial forests into farms and turned oceans into highways. Humans and our domestic animals now account for an estimated 96 percent of all terrestrial mammal biomass. Wild mammals account for just four percent. Amid the cataclysms of the Anthropocene, we tend to think of ourselves as the primary shapers of our planet. But for all our efforts to tame, simplify, and cordon off nature, we remain just as beholden to the world’s ecological laws as we were more than 200,000 years ago when Homo Sapiens first emerged.
Like the laws of physics, paying attention to our planet’s biological laws empowers us to understand how the world works and to make predictions about the outcomes of our actions. In his latest book, A Natural History of the Future, Rob Dunn – an extraordinarily creative author and ecologist – warns that continuing to ignore these laws will cause us to fail again and again in our attempts to build a sustainable future for our species.
Dunn makes the case that the human species will survive not by simplifying and isolating, but through embracing biodiversity and living in accordance with the knowledge that we are at the mercy of the law of natural selection, the species-area law, and the diversity-stability law, to name a few examples. These laws aren’t merely fascinating phenomena. Understanding these inescapable rules of ecology is key to our survival and quality of life. Whether or not we heed them will have profound consequences for our future.
“When you go to these elephants and you study their networks and you study their behavior, you find in elephants the same, I would argue, type of friendship that you find in us,” Dr. Christakis says. “I find that incredibly moving. If we can share this property with elephants for God’s sake, we can certainly share it with each other.” (Photo: Via Yale Human Nature Lab)
For decades, researchers have debated whether or not animals make friends. “Friends” — the taboo “f word” — was generally put in quotes if it was used at all. But if you study the social networks of elephants, whales and other animals, it is clear that they have friends just like we do, according to the renowned sociologist Dr. Nicholas Christakis. Friendship, like other societal characteristics, evolved independently and convergently across species. Co-Director of the Yale Institute for Network Science, Dr. Christakis is a leading Yale sociologist and physician known for his research on human social networks and biosocial science. In this episode, he speaks with us about the ancient origins and modern implications of our common animality and his remarkable new book, Blueprint: The Evolutionary Origins of a Good Society.
In his new book Blueprint: The Evolutionary Origins of a Good Society, Dr. Christakis investigates the biological foundations of our impulse toward the good. “For too long,” he writes, “the scientific community has been overly focused on the dark side of our biological heritage: our capacity for tribalism, violence, selfishness, and cruelty. [But] our good deeds are not just the products of Enlightenment values. They have a deeper and prehistoric origin …. we come to this sort of goodness just as naturally as we come to our bloodier inclinations.”
For decades, radio astronomers have combed the skies for signals from alien life. But according to our guest, Dr. Peter Godfrey-Smith, we’ve overlooked a form of intelligence so remote from ours it might as well be alien. It’s our evolutionary cousin, the octopus, a sea-dwelling mollusk that made headlines in 2016 for escaping from a New Zealand aquarium through a drain pipe. Because our most recent common ancestor was so simple and ancient, says Godfrey-Smith, the octopus represents an independent experiment in the evolution of minds and complex behavior. It confronts us with a mind in many ways radically different from our own, with which humans have nonetheless managed to make contact. Diving with cephalopods has led him to wonder: what might these strange creatures have to teach us about consciousness?
“The whole picture that we inherit from earlier philosophical traditions of a body as something that is semi-distinct from the mind, something that is steered around by a central controller…is very much put into question by the octopus, which has such a different relationship between the control systems and the thing being controlled, the material body itself,” says Dr. Peter Godfrey-Smith.
