CNN – World

By Sheena McKenzie, CNN Air pollution is slashing years from billions of people’s lives around the world and is a greater threat to life expectancy than smoking, HIV/AIDS or war, a report published Wednesday shows. In countries where air pollution levels are below standards set by the World Health Organization (WHO), people are, on average,

By Tara John, CNN While hospitals around the United States report oxygen shortages as they treat primarily unvaccinated Americans, a recent University of Washington model said it is possible another 100,000 people could die from Covid-19 by December. That terrifying forecast could be prevented if more Americans get vaccinated, Dr. Anthony Fauci, director of the

By Ashley Strickland, CNN At first whiff, you might think all skunks are the same. Not so. Meet spotted skunks, “the acrobats of the skunk world.” Scientists have discovered that there are more of these species than they thought, according to new research. More recently, the agreed-upon number was four. But a new study published

By Joshua Berlinger, Adam Renton, Lauren Said-Moorhouse and Aditi Sangal, CNN The-CNN-Wire™ & © 2021 Cable News Network, Inc., a WarnerMedia Company. All rights reserved.

By Megan Marples, CNN Laughter transcends all languages — and now scientists know this spontaneous response is universal across some primate species, too. The laughing patterns of human infants match those of great apes, according to a study published Tuesday in Biology Letters. Human adults primarily laugh while exhaling, whereas infants and great apes laugh

By Joshua Berlinger, Adam Renton, Lauren Said-Moorhouse, Aditi Sangal, Meg Wagner, Melissa Macaya and Melissa Mahtani, CNN The-CNN-Wire™ & © 2021 Cable News Network, Inc., a WarnerMedia Company. All rights reserved.

By Melissa Mahtani, Melissa Macaya, Veronica Rocha, Brad Lendon, Jessie Yeung and Sheena McKenzie, CNN The-CNN-Wire™ & © 2021 Cable News Network, Inc., a WarnerMedia Company. All rights reserved.

By Fernando Alfonso III, CNN The-CNN-Wire™ & © 2021 Cable News Network, Inc., a WarnerMedia Company. All rights reserved.

By Fernando Alfonso III and Mike Hayes, CNN The-CNN-Wire™ & © 2021 Cable News Network, Inc., a WarnerMedia Company. All rights reserved.

By Ashley Strickland, CNN The weather on Earth can be strange, but it may be nothing compared to global dust storms or nighttime snowfall on Mars that scientists are just beginning to understand. Before we send humans to other destinations across the solar system, the ability to create accurate weather forecasts will be necessary, according

By Ashley Strickland, CNN Some of the most insightful discoveries about the past have been found in caves. Like sanctuaries of history, caves have sheltered delicate fossils, artwork, ancient tools and even DNA in the dirt. Every unearthed revelation is another piece of the evolutionary puzzle. Places like Denisova Cave are the reason we know