Babbage from The Economist (subscriber edition)

As debates over vaccinating children rage and the Delta variant of covid-19 surges in many countries, what impact will the return to classrooms have on the covid-19 pandemic? Also, our science correspondent Alok Jha asks ecologist Meg Lowman about the secrets that can be revealed by exploring the treetops. And the northern white rhino is nearing extinction, but can technology bring this species back from the brink? Kenneth Cukier hosts. For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.Terms and conditions for the book competition featured in this podcast are available at economist.com/podcast-contest.

The 20th Century was a golden age for physics but some of its ideas for explaining the material universe have been thrown into doubt. Could a theory known as entropic gravity usher in a new dawn? Also, how should scientists engage with science deniers? And, the technology behind the next generation of prosthetic limbs. Natasha Loder hosts. For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.

Solar geoengineering has the potential to help counteract global warming, so why are scientists so cautious about it? Host Kenneth Cukier also explores a new, green idea that could revolutionise air conditioning. And our obituaries editor remembers Steven Weinberg, a Nobel laureate in physics who united two of the known forces in the universe.For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.

Amateurs, activists and academics are using technology and open-source data to uncover state secrets. Shashank Joshi, The Economist’s defence editor, explores how open-source intelligence is disrupting statecraft and asks John Brennan, a former director of the CIA, how these techniques are being used alongside secret intelligence to detect missile silos in China.Guests include Elliot Higgins, founder of Bellingcat, an open-source intelligence collective; Melissa Hanham, affiliate at Stanford University’s Center for International Security and Cooperation; and Dr Amy Zegart, author of "Spies, Lies and Algorithms".For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.

The discovery of insulin was a breakthrough in medicine, allowing millions of people to live with diabetes. Host Kenneth Cukier investigates how this life-changing innovation happened. Yet today less than half of the people in the world who need it have access to insulin — how can it be made more accessible? And what does the future hold for insulin treatments?For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.

Google’s DeepMind has developed an artificial-intelligence system that can predict the three-dimensional shape of proteins. How will this monumental step-change for biology be used? Also, a new study shows how wearable devices could help doctors understand long covid. And how songbirds reacquired an ability lost by their dinosaur ancestors. Kenneth Cukier hosts For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.

High stakes and big money lead some athletes to cheat at the Olympic games. Tim Cross, The Economist’s Technology editor, investigates the prevalence of doping in sport and asks if testing can ever keep a lid on the use of performance enhancing drugs. He finds out the impact of the pandemic on testing at the Tokyo games, talks to Olympians about the pressures involved and imagines what if doping restrictions were removed.For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.

Countries with high covid-19 vaccination rates, including England, are lifting social restrictions. Behavioural scientist Katy Milkman and health-policy editor Natasha Loder assess the impact of these changes. Will mask-wearing and social distancing stick? And, how people may one day drill for copper as they now drill for oil. Kenneth Cukier hostsFor full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.

As urbanisation progresses and lethal heatwaves become more common, could miniature forests help air-condition cities? Plus, how virtual clinical trials could save money, time and lives. And, counting the hidden costs of artificial intelligence with Kate Crawford, cofounder of the AI Now Institute at NYU and author of “Atlas of AI”. Kenneth Cukier hostsFor full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience

An unlimited supply of clean, carbon-free energy—nuclear fusion is a technology that could change the world. Can engineers make fusion work on a commercial scale? Also, mathematician Jordan Ellenberg on how geometry shapes the world. And, why one of the most common sporting injuries is more of a risk to women than men—and how to prevent it. Kenneth Cukier hosts For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience.