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Scientists have discovered a way to store the Sun’s energy in rocks and convert the heat into electricity. Using an approach called concentrated solar power, a team of researchers from Tanzania found that certain granite and soapstones could store solar heat at a sufficiently high density to serve as a primitive form of battery. Thermal energy storage has been touted as a low-cost way of storing and harvesting energy from the Sun, even when it’s no longer shining. Last year, scientists from Sweden and China came up with a way to store solar energy for nearly two decades using an ultra-thin chip, which serves as a thermoelectric generator. The innovative system could technically be integrated into electronics, however it remains too costly to implement at scale. By contrast, the granite and soapstone samples offer a low cost and readily available method of storing solar energy, the researchers said. “Using rocks as a storage medium offers the potential of affordability due to the abundance and low cost of rocks,” the researchers noted in a paper outlining their findings. “An air-rock bed has low investment cost, high reliability and efficiency, is environmentally friendly, and does not require the use of heat exchangers.” The rock bed captures and collects solar thermal energy up to 600 °C, which is then used to boil liquid into steam that powers a generator turbine to produce electricity. The results were detailed in a study, titled ‘Experimental Investigation of Soapstone and Granite Rocks as Energy-Storage Materials for Concentrated Solar Power Generation and Solar Drying Technology’, published by the American Chemical Society. Other thermal energy storage systems have focussed on salt and water, with researchers at Eindhoven University of Technology unveiling a heat battery last year that they claim could work at scale. Rather than capturing heat from the Sun, the system instead collects industrial residual heat. “While the potential is great, we have also seen many great potential technologies that have not made it,” the scientists said at the time. “So we’re going to keep our feet on the ground and take this one step at a time.” Read More Scientists break world record for solar power window material Scientists smash world record for solar power window material Nasa holds urgent meeting about sightings of UFOs Opinion: The real reason companies are warning that AI is as bad as nuclear war

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A Twitch streamer was left stunned after he livestreamed himself shaving his hair for charity, only to find an indent on his head from wearing his gaming headset. The gamer, who goes by Curtoss on streaming platform Twitch, went live on 3 June to raise money for the charity organisation, Leukemia & Lymphoma Society. While shaving his head for charity, viewers witnessed Curtoss’s shock when he discovered that his head shape had completely changed due to his prolonged headset use. “The shaver’s working like a champ,” Curtoss said, as he began shaving his hair down the middle of his head. Within seconds, he noticed an indent across the top of his head. “Dude, I have an indent like right here, this is where my headphones go!” he told viewers. “I have a f***ing headphone indent on my head! What the f***?” “I always thought that was just my hair,” he added. It didn’t take long for Curtoss’s reaction to go viral on social media. He shared a clip of his mid-shave discovery to his TikTok, while on Twitter, a video of his head indent received more than 42 million views. Surprisingly, Curtoss wasn’t the only one to find an indent on their head from wearing headphones. “Welcome to the club,” replied one Twitter user, who shared photos of two gamers with indents on their skulls. “We all got one of those at one point or another,” another gamer joked. “Tell me why I’ve just rubbed my head to make sure I don’t have one,” shared one person, while another wrote: “New fear just unlocked” “This is why I will never wear a headset for prolonged time periods,” said someone else. So, can prolonged headphones really cause permanent damage? Yes and no. While there are risks to wearing headphones for long periods of time, head indents are temporary. In fact, Headphonesty reports that it takes at least 135 kg to cause a minor fracture to the skull. However, streamers can get “headphone hair” from wearing a headphone headband for too long, wherein the headset puts too much pressure on the head and flattens the hair. But much like indents on the scalp, hair should gradually return to its original shape in just a few minutes. In order to help get rid of headphone dents on the scalp or hair faster, gamers can gently massage the dent and the surrounding area. A hot shower might help return the head to its original shape, but taking breaks from wearing headphones is the most effective way to avoid causing a dent in the scalp. @curtoss please don't call it "Brain Valley" ?♂️ #twitch #livestreamfails #gamer ♬ original sound - nintendo loser While gamers and Twitch streamers don’t need to worry about changing the shape of their head, prolonged headphone use can lead to permanent hearing loss. The World Health Organization (WHO) estimates that around 50 per cent of people ages 12 to 35 are at risk of hearing loss due to prolonged and excessive exposure to loud sounds, including through headphones. According to the American Osteopathic Association, many headphones and MP3 players today can produce sounds up to 120 decibels, which is equivalent to a sound level at a rock concert. At 120 decibels, hearing loss can occur after only about an hour and 15 minutes. Experts suggest that people should exceed no more than 60 per cent of maximum volume when using headphones. The Independent has contacted Curtoss for comment. Read More Ukrainian schoolboy to buy home for his mother after selling Minecraft server Male characters in video games have 50 per cent more dialogue than female counterparts What is Discord, the chatting app tied to classified leaks? Mother sparks debate over parent who wouldn’t give her daughter a slice of cake How to protect pets from wildfire smoke amid air quality alert ‘Fearful’ Shannen Doherty reveals her cancer has spread to her brain