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Heat is testing the limits of human survivability. Here’s how it kills
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Philip Kreycik should have survived his run.

In the summer of 2021, the 37-year-old ultra-marathon runner used an app to plot a roughly 8-mile loop through Pleasanton Ridge Regional Park in California, a huge stretch of parkland threaded with trails.

On the morning of July 10, as temperatures crept into the 90s, Kreycik set off from his car, leaving his phone and water locked inside. He started at a lightning pace — eating up the first 5 miles, each one in less than six minutes.
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Then things started to go wrong. GPS data from his smartwatch showed he slowed dramatically. He veered off the trail. His steps became erratic. By this time, the temperature was above 100 degrees Fahrenheit.

When Kreycik failed to show up for a family lunch, his wife contacted the police.
It took more than three weeks to find his body. An autopsy showed no sign of traumatic injuries. Police confirmed Kreycik likely experienced a medical emergency related to the heat.

The tragedy is sadly far from unique; extreme heat is turning ordinary activities deadly.

People have died taking a stroll in the midday sun, on a family hike in a national park, at an outdoor Taylor Swift concert, and even sweltering in their homes without air conditioning. During this year’s Hajj pilgrimage in June, around 1,300 people perished as temperatures pushed above 120 degrees Fahrenheit in Mecca.

Inside a heat chamber
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Kreycik had almost everything on his side when he went running on that hot day: he was extremely fit, relatively young and was an experienced runner.

While some people are more vulnerable to heat than others, including the very old and young, no one is immune — not even the world’s top athletes. Many are expressing anxiety as temperatures are forecast to soar past 95 degrees this week in Paris, as the Olympic Games get underway.
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Scientists are still trying to unravel the many ways heat attacks the body. One way they do this is with environmental chambers: rooms where they can test human response to a huge range of temperature and humidity.

CNN visited one such chamber at the University of South Wales in the UK to experience how heat kills, but in a safe and controlled environment.

“We’ll warm you up and things will slowly start to unravel,” warned Damian Bailey, a physiology and biochemistry professor at the university. Bailey uses a plethora of instruments to track vital signs — heart rate, brain blood flow and skin temperature — while subjects are at rest or doing light exercise on a bike.

The room starts at a comfortable 73 degrees Fahrenheit but ramps up to 104. Then scientists hit their subjects with extreme humidity, shooting from a dry 20% to an oppressive 85%.

“That’s the killer,” Bailey said, “it’s the humidity you cannot acclimatize to.”

And that’s when things get tough.

Inside a heat chamber
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Kreycik had almost everything on his side when he went running on that hot day: he was extremely fit, relatively young and was an experienced runner.

While some people are more vulnerable to heat than others, including the very old and young, no one is immune — not even the world’s top athletes. Many are expressing anxiety as temperatures are forecast to soar past 95 degrees this week in Paris, as the Olympic Games get underway.
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Scientists are still trying to unravel the many ways heat attacks the body. One way they do this is with environmental chambers: rooms where they can test human response to a huge range of temperature and humidity.

CNN visited one such chamber at the University of South Wales in the UK to experience how heat kills, but in a safe and controlled environment.

“We’ll warm you up and things will slowly start to unravel,” warned Damian Bailey, a physiology and biochemistry professor at the university. Bailey uses a plethora of instruments to track vital signs — heart rate, brain blood flow and skin temperature — while subjects are at rest or doing light exercise on a bike.

The room starts at a comfortable 73 degrees Fahrenheit but ramps up to 104. Then scientists hit their subjects with extreme humidity, shooting from a dry 20% to an oppressive 85%.

“That’s the killer,” Bailey said, “it’s the humidity you cannot acclimatize to.”

And that’s when things get tough.

The latest on the Paris Olympics
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The Olympic tennis tournament is underway, but the red clay of Roland Garros is missing some of the sport’s biggest stars, including world no. 1 Jannik Sinner.

While some are sidelined by illnesses and injuries, others are abstaining as a result of the professional circuit’s brutal schedule this summer.

Between the French Open, Wimbledon and the US Open, summer is always a busy season for those chasing an elusive Grand Slam title. Though the rest of the sports world sees the Olympics as the ultimate competition, the Games’ anthem falls flat amidst the prestigious yearly summer tournaments in Paris, London and New York.
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Ben Shelton, the rising 21-year-old US star ranked No. 14 in the world, said the Olympics fall at a tough time in the tournament schedule, as he will be coming off a stint in Europe and wants to prepare for the US Open.

“Having to go back to Europe to play on clay, a different surface – it kind of messes up a few lead-up tournaments to the US Open that I would play if I wasn’t playing the Olympics,” Shelton told reporters in the spring.

The latest on the Paris Olympics
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The Olympic tennis tournament is underway, but the red clay of Roland Garros is missing some of the sport’s biggest stars, including world no. 1 Jannik Sinner.

While some are sidelined by illnesses and injuries, others are abstaining as a result of the professional circuit’s brutal schedule this summer.

Between the French Open, Wimbledon and the US Open, summer is always a busy season for those chasing an elusive Grand Slam title. Though the rest of the sports world sees the Olympics as the ultimate competition, the Games’ anthem falls flat amidst the prestigious yearly summer tournaments in Paris, London and New York.
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kraken darknet onion
Ben Shelton, the rising 21-year-old US star ranked No. 14 in the world, said the Olympics fall at a tough time in the tournament schedule, as he will be coming off a stint in Europe and wants to prepare for the US Open.

“Having to go back to Europe to play on clay, a different surface – it kind of messes up a few lead-up tournaments to the US Open that I would play if I wasn’t playing the Olympics,” Shelton told reporters in the spring.

Roland Garros is loud ahead of epic clash between Rafael Nadal and Novak Djokovic. Here's how to watch.
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The first match of the day is about to get going at Court Philippe-Chatrier here at Roland Garros and it is going to be an electric afternoon in the Paris sunshine.

Today’s first contest is a second-round encounter in the women’s tournament between France’s Diane Parry and Poland’s Iga Swiatek. While the home nation’s crowd will certainly be behind Parry, it’s the second clash on the schedule that has everyone’s mouths watering.
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Rafael Nadal, the ‘King of Clay’ and 14-time winner of the French Open held annually on this court, is the sentimental favorite. Nadal has endeared himself to the Paris faithful over the years with his dominance of the French Open and is attempting to make one final run for gold on what could potentially be one of his last runs on these famous clay courts as he alludes to a career which is slowly winding down.

Meanwhile, for Novak Djokovic — the winner of 24 grand slams, the most all-time in the men’s game — Nadal is a major obstacle to the one title he hasn’t won: an Olympic gold medal. The Serb has been open about his desire to win his first gold.

Nadal eked out a win in three sets on Sunday in his first-round match while Djokovic cruised on Saturday in his opening contest. The Spaniard has fought injuries for much of the last two years and his opponent will be favored — but there’s just something different about the Spaniard playing on Roland Garros’ clay.