内容摘要：In the case of gas stoves, about half of the flame’s heat escapes into the room. Electric stoves by comparison can be up to 80% efficient. Of those, induction stoves come out on top with up to 90% efficiency in part because they only heat where the surface contacts the pot.

In the case of gas stoves, about half of the flame’s heat escapes into the room. Electric stoves by comparison can be up to 80% efficient. Of those, induction stoves come out on top with up to 90% efficiency in part because they only heat where the surface contacts the pot.

The third main way is dangerous dehydration. As people sweat, they lose liquids to a point that can severely stress kidneys, Jay said.Many people may not realize their danger, Houston’s Gandhi said.

Dehydration can progress into shock, causing organs to shut down from lack of blood, oxygen and nutrients, leading to seizures and death, said Dr. Renee Salas, a Harvard University professor of public health and an emergency room physician at Massachusetts General Hospital.“Dehydration can be very dangerous and even deadly for everyone if it gets bad enough — but it is especially dangerous for those with medical conditions and on certain medications,” Salas said.Dehydration also reduces blood flow and magnifies cardiac problems, Jay said.

Heat also affects the brain. It can cause a person to have confusion, or trouble thinking, several doctors said.“One of the first symptoms you’re getting into trouble with the heat is if you get confused,” said University of Washington public health and climate professor Kris Ebi. That’s little help as a symptom because the person suffering from the heat is unlikely to recognize it, she said. And it becomes a bigger problem as people age.

One of the classic definitions of heat stroke is a core body temperature of 104 degrees “coupled with cognitive dysfunction,” said Pennsylvania State University physiology professor W. Larry Kenney.

Some scientists use a complicated outside temperature measurement called wet bulb globe temperature, which takes into account humidity, solar radiation and wind. In the past, it was thought that a wet-bulb reading of 95 Fahrenheit (35 Celsius) was the point when the body started having trouble, said Kenney, who also runs a hot box lab and has done nearly 600 tests with volunteers.In this photo provided by Ukraine’s 93rd Kholodnyi Yar Separate Mechanized Brigade press service, a man waits to hear about his missing wife as rescuers clear the rubble of a multi-storey residential building destroyed a day before by a Russian airstrike, in Kostiantynivka, Ukraine, on Thursday, May 8, 2025. (Iryna Rybakova/Ukraine’s 93rd Mechanized Brigade via AP)

In this photo provided by Ukraine’s 93rd Kholodnyi Yar Separate Mechanized Brigade press service, a man waits to hear about his missing wife as rescuers clear the rubble of a multi-storey residential building destroyed a day before by a Russian airstrike, in Kostiantynivka, Ukraine, on Thursday, May 8, 2025. (Iryna Rybakova/Ukraine’s 93rd Mechanized Brigade via AP)Meanwhile at the Kremlin, Putin held talks with

, whom the Russian leader earlier described as Moscow’s “main guest” at Friday’s Victory Day festivities. In the evening, Putin hosted Xi andfor a gala dinner in an apparent effort to showcase Russia’s global clout.