England and Norway players will face off under extreme and dangerous levels of heat stress, scientists say, thanks to a Wet Bulb Index of nearly 90 F. For Norway's national men's soccer team, Saturday's World Cup quarter-final against England will be a first in more ways than one. As the Scandinavian side prepares for the biggest match of its history, it will also face conditions almost unimaginable back home: the punishing combination of South Florida heat, humidity, and blazing sunshine that scientists warn can push the human body to its limits. South Florida's mix of strong sun, hot-air temperature, and high humidity--boosted by a plume of dusty air from the Sahara desert sweeping across the Atlantic through the state--will put the northern European players under a level of heat stress rarely experienced in their native countries. Scientists quantify this heat stress by calculating the WetBulb Globe Temperature. On top of air temperature, the index takes into account humidity, which limits evaporation of sweat from the skin; wind, which can act as a coolant; and solar intensity, as sunshine directly raises individuals' skin and core temperatures.

Power grid operators in the United States are warning that a dangerous heatwave could put more strain on an electric grid already under pressure from surging energy consumption. A stretch of extreme heat is expected to intensify across much of the central and eastern parts of the country this week, peaking from Tuesday through Thursday. Temperatures this week are forecasted to climb above 38 degrees Celsius (100 degrees Fahrenheit) from Boston to Washington, DC, pushing up demand for air conditioning. The heatwave coincides with two major events on the US calendar. Saturday's holiday marks the 250th anniversary of the US's independence, and millions are expected to gather for barbecues, parades and fireworks.

Their winter survival trick is a months-long power-save mode--and scientists think it could help humans, too. This bear woke up like this. Breakthroughs, discoveries, and DIY tips sent six days a week. For many animals that live in cold climates, winter means low-power mode. But no creature is more tied to the image of a long, cozy winter than hibernating bears all snuggled up in their dens.

First introduced during the 1960, the invasive reptiles were'cold-stunned' during a record-breaking cold snap. Breakthroughs, discoveries, and DIY tips sent six days a week. To state the obvious, it's been a particularly frigid winter across most of the eastern United States. Winter's icy grip has not even spared the Sunshine State, where a total of 5,195 frozen green iguanas --an invasive species--have been removed from the ecosystem and euthanized. Green iguanas () are considered an invasive species in Florida.

Humans aren't built for the cold, but have survived frigid temperatures in some amazing cases. Breakthroughs, discoveries, and DIY tips sent six days a week. Winter is not for the faint of heart. In New York City, skyscrapers turn Manhattan into a series of freezing wind tunnels. In Sapporo, Japan, the snowfall is almost 200 inches each winter. Even so, humans have developed plenty of clever ways to wait out the cold. But what would happen if instead of bundling up inside with a hot chocolate, you were left in the frigid cold--just how cold can humans get and recover?

In some remarkable cases, people have survived after their core temperature has plummeted into the 50s. The human body needs to maintain the same internal body temperature or else many vital systems fall apart. Breakthroughs, discoveries, and DIY tips sent every weekday. Whether you prefer sweltering summers or frigid winters, significant temperature changes mean only one thing to your body: bad news. Humans are homeotherms, meaning that our core body temperature stays roughly constant.

Why our bodies shake when it's cold. Involuntary muscle contractions keep us warm and even fight infections. "Shivering is a way for our bodies to generate heat when we are cold," says Dr. Natasha Bhuyan, a family physician based in Phoenix, Arizona. Breakthroughs, discoveries, and DIY tips sent every weekday. You're walking down a Chicago street on a blustery winter day, when a particularly strong wind almost whips you off of your feet.

The gloomy arguments in favor of solar geoengineering are compelling; so are the even gloomier counter-arguments. Stardust is the name of a small startup with enormous ambitions. The company, which is based in Israel and registered in Delaware, proposes to do nothing less than dim the sun. Its business plan is modelled on volcanoes. In a major eruption, millions of tons of sulfur dioxide get thrown up into the stratosphere.

Amazon Prime Day is live. See the best deals HERE. More importantly, it could help preserve life-saving cancer medications. Breakthroughs, discoveries, and DIY tips sent every weekday. Freezer burn is bad enough when it comes to ice cream, but the tiny, jagged ice crystals pose problems for much bigger issues than ruining your dessert.

Heat pumps can save you about $370 per year and are good for the planet. Heat pumps date back to the 1850s and are more energy efficient than furnaces or boilers. Breakthroughs, discoveries, and DIY tips sent every weekday. Colder weather is quickly approaching, which means it's time for many folks to start cranking up the heat in their homes and apartments. But for many Americans, heating up their homes is a costly affair-and it's only getting more expensive.