This episode recounts how a 19th-century challenge led chemist Louis Pasteur to prove that invisible germs cause disease. His groundbreaking experiment with 50 sheep revolutionized medical

This episode recounts how a 19th-century challenge led chemist Louis Pasteur to prove that invisible germs cause disease. His groundbreaking experiment with 50 sheep revolutionized medical science, saving countless lives.

National Geographic is your premier destination for science, exploration, and adventure, bringing you closer to vital stories. Watch the full video: How Solving this Medical Mystery Saved Lives.

Subscribe for more: Nat Geo Subscribe | Visit the Official Site | Explore the Nat Geo YouTube Channel.

Anthony Torres is a Washington, DC-based community organizer who mobilizes thousands of volunteers to advocate for climate justice, fossil fuel resistance, and environmental protection. He has

Anthony Torres is a Washington, DC-based community organizer who mobilizes thousands of volunteers to advocate for climate justice, fossil fuel resistance, and environmental protection. He has organized diverse actions, from a dance party protest outside Ivanka Trump's home to a vigil for Hurricane Harvey victims and a sit-in at Senate Minority Leader Chuck Schumer's office. Torres strives to build accessible narratives that highlight shared humanity while addressing race, class, and gender disparities.

Additionally, Torres serves as the campaign representative for the Sierra Club’s Responsible Trade Program, advocating for an equitable NAFTA agreement that benefits the environment, workers, and communities. He is also a trustee for the Progressive Workers Union, representing Sierra Club employees.

The bicycle offered women of the late 1800s unprecedented freedom. Discover this and other pivotal innovations that shaped modern humanity on "Origins: The Journey of Humankind," hosted by Jason

The bicycle offered women of the late 1800s unprecedented freedom. Discover this and other pivotal innovations that shaped modern humanity on "Origins: The Journey of Humankind," hosted by Jason Silva. New episodes air Mondays at 9/8c.

National Geographic is the world's premium destination for science, exploration, and adventure, bringing you closer to stories that matter. For more content, subscribe, watch "Origins" clips here, and see how Bicycles Changed Women's Lives. Connect with Nat Geo on their Official Site, Facebook, Twitter, Instagram, and YouTube channel.

Growing up in Detroit, Brittany Stallworth, a 2012 Brower Youth Award Winner, faced environmental injustice, including limited healthy food access and exposure to factory emissions. This

Growing up in Detroit, Brittany Stallworth, a 2012 Brower Youth Award Winner, faced environmental injustice, including limited healthy food access and exposure to factory emissions. This experience fueled her to establish "Green is the New Black" at Howard University, a campaign dedicated to food and environmental justice.

Through her initiative, Stallworth organized expert-led workshops for students and a symposium that connected over 35 green organizations with college students for internships and jobs. Her passion has inspired others to advance food accessibility and environmental justice in underserved communities.

Over 1.5 billion people worldwide lack access to electricity, often relying on expensive, hazardous, and polluting kerosene lanterns or candles. The United Nations Millennium Development Goals

Over 1.5 billion people worldwide lack access to electricity, often relying on expensive, hazardous, and polluting kerosene lanterns or candles. The United Nations Millennium Development Goals highlight electrification as crucial for poverty eradication, aiming to electrify 500 million more people by 2015.

Advances in LED technology offer a vital solution. For instance, homemaker Suranjini Kumar transitioned from oil lamps to bright, clean light in her home using D.Light. This demonstrates how modern lighting solutions can improve lives and contribute to global development goals.

Leroy Little Bear, a member of the Small Robes Band of the Blood Indian Tribe, Blackfoot Confederacy, was born and raised on the Blood Indian Reserve. He is the former director of the American

Leroy Little Bear, a member of the Small Robes Band of the Blood Indian Tribe, Blackfoot Confederacy, was born and raised on the Blood Indian Reserve. He is the former director of the American Indian Program at Harvard University and currently chairs Native Studies at the University of Lethbridge. (See his bio)

This video is presented by the Foundation for Global Humanity in collaboration with the Seed Graduate Institute.

Discussions on the Green Economy often overlook its social dimensions. The UN Research Institute for Social Development (UNRISD) addresses this through its project on the Social Dimensions of

Discussions on the Green Economy often overlook its social dimensions. The UN Research Institute for Social Development (UNRISD) addresses this through its project on the Social Dimensions of Green Economy and Sustainable Development. Explore their work at UNRISD.

For broader information on the Green Economy, consult the United Nations Environment Programme (UNEP) at UNEP. Following both UNRISD and UNEP offers insight into how the UN integrates social, environmental, and economic aspects to advance sustainability.

Join National Geographic Photographer Nichole Sobecki in South Africa as she explores efforts to protect wild cheetahs and other big cats from trafficking and habitat loss. This vital work

Join National Geographic Photographer Nichole Sobecki in South Africa as she explores efforts to protect wild cheetahs and other big cats from trafficking and habitat loss. This vital work highlights National Geographic's commitment to science, exploration, and bringing you stories that matter.

Learn more about this critical conservation work: on.natgeo.com/3w7z5Yq. Watch "The Race to Save Big Cats": youtu.be/5yRFSne2OMI. Subscribe for more content: bit.ly/NatGeoSubscribe. Explore National Geographic's official site and social channels for further adventure.

The continental U.S. could face an 8-degree Fahrenheit temperature increase by the end of the 21st century if carbon dioxide concentrations reach 800 parts per million. Current CO2 levels stand at

The continental U.S. could face an 8-degree Fahrenheit temperature increase by the end of the 21st century if carbon dioxide concentrations reach 800 parts per million. Current CO2 levels stand at 400 ppm and are rising faster than at any time in Earth's history.

These projections, from the draft National Climate Assessment, are vividly illustrated through computer model visualizations. Allison Leidner, a NASA scientist, emphasizes that these visualizations effectively communicate the dramatic potential changes to the nation's climate, including future temperature and precipitation scenarios.

Devoted to finding "the sound of life," Fellé innovates by transforming recyclable materials and everyday objects like pails, lids, and pots into musical instruments. This unique approach has

Devoted to finding "the sound of life," Fellé innovates by transforming recyclable materials and everyday objects like pails, lids, and pots into musical instruments. This unique approach has earned him the title "musical wizard" from Dominican music critics.

Explore Fellé's music on Soundclick and view photos from TEDxSantoDomingo.