CrowdScience

Exploring the impact of rising sea levels on mountain elevation signs, the podcast delves into the complexities of measuring sea levels globally. From historical methods to modern technology, scientists strive to understand the dynamic relationship between land, sea, and mountains. The discussion includes a climber's daunting journey to Mount Everest's peak, highlighting the challenges and sacrifices in scientific exploration.

Explore the impact of prayer on mental well-being and delve into the neuroscience behind deep prayer experiences. Comparing prayer to mindfulness practices, discover how different brain regions are involved in self-transcendence. Learn about the effects of Buddhist chanting on brain activity and emotional well-being, and how attachment styles can shape one's connection with God. Dive into the neurological and spiritual aspects of prayer, showcasing the intersection of science, faith, and personal experiences.

Exploring the deadly impact of malaria transmitted by mosquitoes, experts in Malawi discuss the rollout of a new vaccine program. Topics include mosquito feeding habits, genetic modification to combat disease spread, and the challenges in eradicating malaria worldwide.

Explore why some people are better at maths than others, genetics versus environment in shaping math abilities, Finland and China's successful education systems, the concept of number sense, and strategies for overcoming math anxiety and improving skills.

Coastlines around the world are changing, causing serious problems for the many communities living near the sea, as well as vital and fragile coastal ecosystems. In the second of a two-part special on coastal erosion, CrowdScience explores the best ways to tackle this problem. Presenter Caroline Steel visits the Caribbean island of Puerto Rico to see the various methods they use to protect their coasts. First up: ‘riprap’ – rocks strategically placed to keep the encroaching sea at bay. The problem is, while it protects the area immediately behind the rocks, riprap can exacerbate erosion nearby. But there are other, more nature-friendly solutions, including sand dune restoration. Caroline picks up her shovel and helps to re-plant dunes, destroyed in the past by erosion as well as sand extraction for the construction trade. The roots of these plants stabilise the dunes, while building boardwalks prevents further damage from humans. Nature also offers the perfect offshore protection against coastal erosion: coral reefs. These are the first line of defence in absorbing the power of the ocean’s waves. Down on the beach, we see for ourselves just how effective they are. The reefs face threats, but restoration plans are afoot. We visit a nursery that grows corals to plant out on the reefs – and find out about corals’ surprising cannibalistic tendencies in the process. Featuring: Professor Robert Mayer - Director of Vida Marina, Center for Conservation and Ecological Restoration, University of Puerto Rico Nada Nigaglioni - Biology student, University of Puerto Rico Ernesto Diaz - Caribbean Regional Manager at TetraTech Dr Stacey Williams - Executive Director, ISER Caribe Presenter: Caroline Steel Producer: Hannah Fisher Editor: Cathy Edwards Production Co-ordinator: Liz Tuohy Studio Manager: Emma Harth(Photo: Coast restoration measures at Ultimo Trolley Beach, Puerto Rico. Credit: BBC)

Around the world, coastlines are constantly changing due to the power of waves, currents and tides. Coastal areas are also some of the most heavily populated and developed land areas in the world. So it’s not hard to see how the natural process of coastal erosion can cause serious problems for us. It’s an issue that’s been bothering CrowdScience listener Anne in Miami Beach, Florida. She can see the beach from her window and wonders why after every storm, several trucks arrive to dump more sand on it. In this first of two programmes, CrowdScience visits Anne’s home in south Florida and finds out how erosion threatens Florida’s famous beaches. Caroline Steel speaks to geoscientist Dr Tiffany Roberts Briggs and hears why it’s such a problem for this tourist-reliant state. Tiffany explains the delicate balance between natural processes and human infrastructure. Meanwhile, the Caribbean island of Puerto Rico declared a state of emergency in April 2023 due to coastal erosion. Caroline witnesses the impacts of erosion first-hand, as Ruperto Chaparro shows her abandoned houses crumbling into the sea. But how can we quantify the rate of erosion? Dr Kevian Perez in the Graduate School of Planning at University of Puerto Rico explains the methods they use to monitor Puerto Rico’s coastlines, and how they are evaluating the effectiveness of different mitigation methods. However, some of the methods used to protect coastal communities from the encroaching sea have done more harm than good. So what are the best ways to tackle this problem? That’s what we’ll be exploring in next week’s programme. Presenter: Caroline Steel Producer: Hannah Fisher Editor: Cathy Edwards Production Co-ordinator: Liz Tuohy Studio Manager: Steve Greenwood and Bob Nettles Featuring: Dr Tiffany Roberts Briggs, Associate Professor at Florida Atlantic University Ruperto Chaparro, Director of Sea Grant Programme, University of Puerto Rico Anabela Fuentes Garcia, Villa Cristiana community leader Dr Kevian Perez, researcher at the Coastal Research and Planning Institute of Puerto Rico at the Graduate School of Planning(Photo: Puerto Rico after Hurricane Maria. Credit: Orlando Sentinel/Getty Images)

Former auditory scientist Alan Archer-Boyd and host Anand Jagatia delve into how our ears sense direction. From the significance of having two ears and pinnae to the barn owl's hunting prowess, they explore the intricacies of sound localization. An experiment in echolocation with blind activist Thomas Tajo sheds light on the brain's processing of spatial information, revealing fascinating insights into human auditory abilities.

Today there are over eight billion people on Earth. That’s an awe-inspiring figure… but how does it compare to the vast numbers who came before us? Listener Alpha wants to know how many people have ever existed, so CrowdScience sets out to do a historical headcount.The Population Reference Bureau in the USA estimated this number back in the 90s, and have been updating their calculations ever since. Demographer Toshiko Kaneda explains how their model works, the assumptions it makes – and the huge uncertainties around the number it comes out with.We first need a date for when ‘humans’ first began, so Caroline travels to the Natural History Museum in London to meet human evolution expert Chris Stringer, and marvel at his collection of replica fossil skulls. Chris demonstrates how to distinguish our species, Homo sapiens, from other species like Neanderthals. When did these species first appear - and which of them count as human?And once you know where to start the clock, how do you estimate the numbers of people alive at different points in history? For a population demographer like Walter Scheidel, it helps that some ancient civilisations kept detailed censuses, a few of which have survived to the present day. Caroline and Walter pour over one of these census fragments, and learn how to combine them with other archaeological clues to get some very rough numbers.And finally: what does the future of our population look like? Poonam Muttreja from the Population Foundation of India discusses developments in the world’s most populous country, as well as the big demographic trends ahead for humanity. Presenter: Caroline Steel Producer: Phil Sansom Additional Recording: Umaru Fofana Editor: Cathy Edwards Production Co-ordinator: Connor Morgans Studio Manager: Sue Maillot Featuring: Toshiko Kaneda, Technical Director of Demographic Research, Population Reference Bureau Chris Stringer, Research Leader in Human Evolution, Natural History Museum London Walter Scheidel, Professor of Classics and History, Stanford University Poonam Muttreja, Executive Director, Population Foundation of India

Volcanologist Geoff Kilgour discusses the potential link between climate change and volcanic eruptions. The podcast explores how a warmer atmosphere may influence the earth's core and lead to increased volcanic activity. It also highlights the impact of climate change triggers, like heavy rain destabilizing lava domes, resulting in more dangerous eruptions. The episode emphasizes the need for interdisciplinary cooperation to understand the complex relationship between weather patterns and volcanic behavior.

Explore the origins of anxious habits in humans and animals, with insights from experts in animal behavior. Discover how animals self-soothe, from a mouse cleaning a shed to an otter sucking its thumb. Learn how to create a supportive home environment for pets and spot unhelpful habits. Uncover the connection between animal emotions and human learning, with tips on promoting calm and confidence in animals through natural behaviors.