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Curly hair may have been critical to human evolution
Curly hair may have been critical to human evolution
Curly hair may have been absolutely critical to humans evolving millions of years ago, scientists have discovered. In fact, having curly hair could have been the key reason as to why humans developed, grew taller and came to have larger brains. It’s all to do with regulating body temperature, according to a new study by researchers at Penn State University. Given that hair can help to protect the head from the sun’s rays, it’s thought that thicker, curlier hair types could have been key to human life progressing in Equatorial Africa. Scientists recreated the kinds of conditions that early humans would have experienced, using wigs featuring different hair types on models. They found that curls were most effective in keeping the models cool in an environment measuring 86 degrees Fahrenheit (30 degrees Celsius) and 60 per cent humidity. Tina Lasisi is the study's lead author. She spoke to Newsweek about the findings and said: "We hypothesized that tightly curled scalp hair would provide some benefits, but the extent of these benefits was uncertain. "Previous studies on mammalian coats have shown that hair can limit the amount of sunlight reaching the skin, but we were particularly surprised by the significant reduction in solar heat radiation impact provided by tightly coiled hair.” The reduction in heat caused by tight curls could have led to the development of larger brains. "Once humans developed large brains, they could employ other behavioral and social strategies to cope with heat, potentially diminishing the relative advantage of curly hair," she said. "This could have led to a diverse distribution of hair textures worldwide. Furthermore, since straight hair better retains heat, populations in colder environments may have experienced selective pressure for straight hair." She added: "Future research should aim to answer these questions by incorporating our data into mathematical models of human physiology or conducting experiments with human subjects who have different hair textures to examine the impact on their thermal regulation.” Sign up for our free Indy100 weekly newsletter Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings
2023-09-06 00:52
Wales in ‘a positive place’ with injuries ahead of World Cup, says Warren Gatland
Wales in ‘a positive place’ with injuries ahead of World Cup, says Warren Gatland
Wales boss Warren Gatland has reported a clean bill of health among his World Cup squad heading into the crunch tournament opener against Fiji. Co-captain Dewi Lake and number eight Taulupe Faletau were among a handful of players who nursed injuries during Wales’ World Cup warm-up Tests. Number eight Faletau played no part in those fixtures due to a calf muscle problem, while hooker Lake went off after suffering a knee injury during Wales’ defeat against England at Twickenham. Ryan Elias, Dafydd Jenkins and Gareth Anscombe have also recovered to be available for Sunday’s Pool C clash in Bordeaux. “The last couple of weeks we’ve had a few niggles – we had eight or 10 players not taking a full part in training,” Gatland said. “Nothing serious, but just a few bumps. They’ve all been rehabbed and everyone is now fit, which is a positive place for us to be in. “He (Faletau) has been taking a full part in training for the past three weeks. “There is no doubt in the first week he was blowing pretty hard in terms of some of the set-piece stuff the boys have been doing for a number of weeks. “That has taken a little bit of time, but we’ve kept a close eye on his GPS figures and they have been excellent for him. “Even though he hasn’t been running around, he has done a lot of off-feet conditioning. Some of the work on the side of the pitch is harder than being on the pitch, and he is definitely in contention for the weekend.” Lake departed during the first half at Twickenham, and the hooker added: “It always plays on your mind when you come off injured 20 minutes into a game. “I am very grateful to be sat here, to the medical staff who got me through the three weeks at home and the coaching staff for selecting me post-injury. “A lot of hard work has gone on behind the scenes to get me ready for this weekend.” Wales trained amid temperatures of more than 30 degrees on Tuesday, while the forecast for Sunday’s encounter is for 28 degrees at kick-off, even though the game does not start until 9pm local time. It is understood that World Cup organisers are considering water breaks during the opening round of pool fixtures. “We would like the ball on the park as often as we could. We think we’re in pretty good shape physically,” Gatland said. “In terms of that, we are not going to push back on water breaks if that’s what is decided. We won’t be arguing with World Rugby on that decision.” It will be a fifth successive World Cup for Wales and Fiji to meet in the pool stage, and Sunday’s victors will take a significant step towards the quarter-finals. Fiji are fresh from an outstanding away victory over England, and they are fancied by many to defeat a Wales side with just three wins from 13 Tests. “I thought they were excellent at Twickenham,” Gatland added. “They have got some great athletes, we are aware of that. “They are a lot more structured now as a team than they would traditionally have been in the past. “We’ve got to impose our game on them as well. We know they are a good side at the moment, and a lot of their side play in Super Rugby and in France as well. It’s going to be an exciting challenge. “They have always had incredibly world-class individual athletes who could open up a game. But bringing that organisation and structure makes them more dangerous. “I think from a coaching perspective, the ultimate pinnacle is the World Cup. It’s the one time in international windows that you get full preparation. “It feels like you’re working with a club side in having a pre-season. We’ve been able to work on a lot of things in the last few months in terms of the detail and putting together a strategy.” Read More Charity boss speaks out over ‘traumatic’ encounter with royal aide Ukraine war’s heaviest fight rages in east - follow live Clubs send out wrong message playing footballers accused of abuse – Women’s Aid Shane Lowry defends Ryder Cup selection and says Europe have ‘best 12 players’ Ireland trio Jack Conan, Dan Sheehan and Dave Kilcoyne out of World Cup opener
2023-09-06 00:52
BlackRock trims government bonds underweight, more cautious on credit
BlackRock trims government bonds underweight, more cautious on credit
By Davide Barbuscia NEW YORK The BlackRock Investment Institute said on Tuesday it had become less bearish on
2023-09-06 00:49
Jury selection begins in contempt case against ex-Trump White House official Peter Navarro
Jury selection begins in contempt case against ex-Trump White House official Peter Navarro
Jury selection has begun in the case against former Trump White House official Peter Navarro, who's charged with contempt of Congress
2023-09-06 00:48
Ganna wins Vuelta time trial as Evenepoel hurts rivals
Ganna wins Vuelta time trial as Evenepoel hurts rivals
Jumbo's American rider Sepp Kuss did enough to retain the Vuelta a Espana overall lead on a gruelling 25.8km stage 10 individual time trial won...
2023-09-06 00:46
Prosecutors ask for 33 years in prison for ex-Proud Boys leader Enrique Tarrio
Prosecutors ask for 33 years in prison for ex-Proud Boys leader Enrique Tarrio
Former Proud Boys Chairman Enrique Tarrio is scheduled to be sentenced by a federal judge Tuesday for leading a failed plot to forcibly prevent the peaceful transfer of power from then-President Donald Trump to Joe Biden after the 2020 election.
2023-09-06 00:29
Wisk Brings Autonomous Air Taxi to Heart of Washington DC
Wisk Brings Autonomous Air Taxi to Heart of Washington DC
MOUNTAIN VIEW, Calif.--(BUSINESS WIRE)--Sep 5, 2023--
2023-09-06 00:28
US House panel probes federal response to air, rail safety issues
US House panel probes federal response to air, rail safety issues
By David Shepardson WASHINGTON The House of Representatives Oversight Committee said on Tuesday it is investigating the U.S.
2023-09-06 00:28
UFC 293 card in full as Adesanya defends title against Strickland this weekend
UFC 293 card in full as Adesanya defends title against Strickland this weekend
The middleweight title is on the line in the main event of UFC 293 this weekend, as Israel Adesanya defends the belt against Sean Strickland. Adesanya became a two-time champion in April, knocking out Alex Pereira to take back the gold that he lost to his old rival in November. The Nigerian-New Zealander was eyeing a fight with Dricus Du Plessis as the first title defence of his second reign, but Du Plessis is recovering from an injury, opening the door for the controversial Strickland. Ranked fifth, Strickland (27-5) enters Australia on a two-fight win streak, with many fans interested to see and hear the American’s verbal exchanges with Adesanya (24-2) this week. Here’s all you need to know. We may earn commission from some of the links in this article, but we never allow this to influence our content. This revenue helps to fund journalism across The Independent. When is UFC 293? The event is set to take place on Saturday 9 September, at the Qudos Bank Arena in Sydney, Australia. The early prelims are due to begin at 11.30pm BST (3.30pm PT, 5.30pm CT, 6.30pm ET), with the regular prelims following at 1am BST on Sunday 10 September (5pm PT, 7pm CT, 8pm ET on Saturday). The main card is then scheduled for 3am BST on Sunday (7pm PT, 9pm CT, 10pm ET on Saturday). How can I watch it? The card will air live on TNT Sports in the UK, with the broadcaster’s app and website also streaming the fights. In the US, ESPN+ will stream the action live, as will the UFC’s Fight Pass. If you’re travelling abroad and want to watch the event, you might need a VPN to unblock your streaming app. Our VPN round-up is here to help: Get great deals on the best VPNs in the market. Odds Adesanya – 2/13 Strickland – 9/2 Via Betway. • Get all the latest UFC betting sites’ offers Full card (subject to change) Main card Israel Adesanya (C) vs Sean Strickland (middleweight title) Tai Tuivasa vs Alexander Volkov (heavyweight) Manel Kape vs Felipe dos Santos (flyweight) Justin Tafa vs Austen Lane (heavyweight) Tyson Pedro vs Anton Turkalj (light-heavyweight) Prelims Carlos Ulberg vs Da Woon Jung (light-heavyweight) Jack Jenkins vs Chepe Mariscal (featherweight) Jamie Mullarkey vs John Makdessi (lightweight) Nasrat Haqparast vs Landon Quinones (lightweight) Early prelims Mike Diamond vs Charlie Radtke (welterweight) Shane Young vs Gabriel Miranda (featherweight) Kevin Jousset vs Kiefer Crosbie (welterweight) Read More Jared Cannonier revealed as back-up fighter for Adesanya vs Strickland at UFC 293 Conor McGregor finally receives black belt in jiu-jitsu Deja vu for Ciryl Gane as heavyweight scores statement win at UFC Paris Back-up fighter revealed for Adesanya vs Strickland at UFC 293 Conor McGregor finally receives black belt in jiu-jitsu Mark Zuckerberg trains with UFC champions on speedboat
2023-09-06 00:28
Spanish soccer federation fires women's national team coach Jorge Vilda amid Rubiales controversy
Spanish soccer federation fires women's national team coach Jorge Vilda amid Rubiales controversy
The Spanish soccer federation has fired women’s national team coach Jorge Vilda less than three weeks after Spain won the Women’s World Cup title and amid the controversy involving suspended federation president Luis Rubiales
2023-09-06 00:28
Alex Murdaugh's attorneys accuse clerk of court of jury tampering in motion seeking new murder trial
Alex Murdaugh's attorneys accuse clerk of court of jury tampering in motion seeking new murder trial
Attorneys representing Alex Murdaugh, the notorious South Carolina fraudster who was convicted earlier this year of murdering his wife and son, filed a motion with the South Carolina Court of Appeals on Tuesday demanding a new trial and alleging jury tampering by the Colleton County Clerk of Court.
2023-09-06 00:25
Adesanya vs Strickland time: When does UFC 293 start in UK and US this weekend?
Adesanya vs Strickland time: When does UFC 293 start in UK and US this weekend?
Israel Adesanya takes on Sean Strickland in the main event of UFC 293 this weekend, defending the middleweight title in Sydney. Adesanya began his second reign as champion in April, knocking out Alex Pereira to finally earn a win over his old rival, who took the belt from Adesanya in November. Now, the Nigerian-New Zealander defends the gold against Strickland, with the controversial contender entering Australia on a two-fight win streak. American Strickland, ranked fifth, was Adesanya’s second choice for a challenger here; the champion had his eyes on Dricus Du Plessis, but the South African sustained an injury to delay that potential grudge match. Many fans, however, are excited to see Strickland (27-5) finally get his shot at Adesanya (24-2). Here’s all you need to know. We may earn commission from some of the links in this article, but we never allow this to influence our content. This revenue helps to fund journalism across The Independent. When is UFC 293? The event is set to take place on Saturday 9 September, at the Qudos Bank Arena in Sydney, Australia. The early prelims are due to begin at 11.30pm BST (3.30pm PT, 5.30pm CT, 6.30pm ET), with the regular prelims following at 1am BST on Sunday 10 September (5pm PT, 7pm CT, 8pm ET on Saturday). The main card is then scheduled for 3am BST on Sunday (7pm PT, 9pm CT, 10pm ET on Saturday). How can I watch it? The card will air live on TNT Sports in the UK, with the broadcaster’s app and website also streaming the fights. In the US, ESPN+ will stream the action live, as will the UFC’s Fight Pass. If you’re travelling abroad and want to watch the event, you might need a VPN to unblock your streaming app. Our VPN round-up is here to help: Get great deals on the best VPNs in the market. Odds Adesanya – 2/13 Strickland – 9/2 Via Betway. • Get all the latest UFC betting sites’ offers Full card (subject to change) Main card Israel Adesanya (C) vs Sean Strickland (middleweight title) Tai Tuivasa vs Alexander Volkov (heavyweight) Manel Kape vs Felipe dos Santos (flyweight) Justin Tafa vs Austen Lane (heavyweight) Tyson Pedro vs Anton Turkalj (light-heavyweight) Prelims Carlos Ulberg vs Da Woon Jung (light-heavyweight) Jack Jenkins vs Chepe Mariscal (featherweight) Jamie Mullarkey vs John Makdessi (lightweight) Nasrat Haqparast vs Landon Quinones (lightweight) Early prelims Mike Diamond vs Charlie Radtke (welterweight) Shane Young vs Gabriel Miranda (featherweight) Kevin Jousset vs Kiefer Crosbie (welterweight) Read More Jared Cannonier revealed as back-up fighter for Adesanya vs Strickland at UFC 293 Conor McGregor finally receives black belt in jiu-jitsu Deja vu for Ciryl Gane as heavyweight scores statement win at UFC Paris Back-up fighter revealed for Adesanya vs Strickland at UFC 293 Conor McGregor finally receives black belt in jiu-jitsu Mark Zuckerberg trains with UFC champions on speedboat
2023-09-06 00:24
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