Earth & Environment
Humans were using horses thousands of years earlier than thought
Horses have shaped human history in powerful ways, from ancient travel and trade to warfare and exploration.
Now, new research suggests that humans started using...
GDP surpasses national debt – is that a problem
Gross Domestic Product totaled $31.22 trillion between April 2025 and March 2026 and public debt totaled $31.27 trillion.
At first glance, the news that the...
After an opaque summit, China and the US want to work together again. That...
Back in 2005, US economist Fred Bergsten coined the term “Group of 2” or “G2”, proposing a stronger partnership between what are now the...
Neanderthals may have performed dental surgery 60,000 years ago
A surprising new discovery suggests that Neanderthals may have carried out a form of dental treatment nearly 60,000 years ago.
Researchers studying an ancient tooth...
Why carbon dioxide cools the upper atmosphere while heating Earth below
Scientists have long known something strange is happening in Earth’s atmosphere. While greenhouse gases are warming the planet’s surface and lower atmosphere, the upper...
Stardust trapped in Antarctic ice reveals tens of thousands of years of solar system’s...
When you think of outer space, you're likely picturing stars, planets and moons. But much of space is filled with clouds of gas, plasma...
Earth’s first continents formed billions of years earlier than expected
Scientists studying some of the oldest rocks on Earth have uncovered new evidence that the planet’s first continents may have started forming through plate...
Scientists discover crystal that captures drinking water using only light
Scientists at the University of Iowa have developed a new material that can capture water directly from the air using only light.
The discovery could...
What it would have been like to experience the dinosaur‑killing asteroid Armageddon
A great Tyrannosaurus rex strides through the conifer trees of her territory, sniffing the air.
She picks up the scent from the carcass of a...
Shark embryos reveal ancient blueprint behind the faces of all jawed animals
Scientists studying shark embryos have uncovered evidence that the basic blueprint for building faces in jawed animals has remained largely unchanged for more than...
How ‘snowball Earth’ was a tug-of-war
Decades of research shows that Earth was once entirely or almost entirely frozen.
The episode is known as Snowball Earth, and though its occurrence is...
Scientists find major errors in global climate pollution database
A new study from researchers at Northern Arizona University has raised concerns about the accuracy of a widely used global greenhouse gas emissions database...
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New study uncovers evidence of ancient comet airburst
A new study reveals compelling evidence supporting the Younger Dryas Impact hypothesis, which suggests that a fragmented comet collided with Earth's atmosphere 12,800 years...
How limestone and seawater could help ships cut carbon emissions in half
Ships play a major role in global trade—but they’re also a big source of carbon emissions.
In fact, the shipping industry is responsible for nearly...
Even mild air pollution may quietly damage your heart, study finds
A new study has found that breathing in common air pollutants over many years is linked to early signs of heart disease—even when the...
Dog vs. machine: Who’s a better bomb detector?
What's better at finding a hidden bomb -- a dog or an electronic chemical detector?
In this episode, the Reactions team travels to the U.S....
Ray Dalio: Humans always have an edge over computers
It has been a dream for a long time for humans to create machines that have the ability to make decisions on their own.
Now...
Scientists discover deep-sea minerals create oxygen in complete darkness
A groundbreaking discovery by an international team of researchers, including a chemist from Northwestern University, has found that metallic minerals on the deep-ocean floor...
Scientists discover how axolotls use the ‘fight or flight’ system to regrow limbs
For centuries, scientists have marveled at salamanders’ ability to regrow entire limbs, but exactly how they do it has remained a mystery—until now.
A new...
Car sharing and second-hand phones: Not as green as they seem, study shows
Many people are looking for ways to reduce their environmental impact, and businesses often promote car sharing and second-hand phone sales as eco-friendly solutions.
However,...