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Agnetha Faltskog and Gary Barlow first released the song a decade ago.

A natural phenomenon consisting of polka-dot-style formations has been cropping up around the world, and scientists are baffled as to why. The circular-shaped patches of ground have been seen in deserts in Australia and Namibia but now experts believe they are more widespread than originally thought. Known as “fairy circles”, there are now 263 known sites across the globe where they can be found, according to new research published in the journal Proceedings of the National Academy of Sciences (PNAS). They have been documented in 15 countries, across three continents, including the Sahel region of Africa, Madagascar, and in Middle-West Asia. And yet, despite the spread of these anomalies, scientists are still none the wiser about how they actually form. A team led by environmental scientist Emilio Guirado, of the University of Alicante in Spain, explained in their paper on the "intriguing" phenomenon: “We conducted a global and systematic assessment of fairy circle-like vegetation patterns and discovered hundreds of [fairy-circle]-like locations on three continents. “Our study provides insights into the ecology and biogeography of these fascinating vegetation patterns and the first atlas of their global distribution.” The mysterious circles appear in desert regions and can be as wide as 12 metres (39 feet) in diameter. They are almost always spaced out and rarely connect or overlap with one another. Several theories have been put forward as to what causes them, including, tiny insects, termites, and plant toxins. But, none have been accompanied by any significant evidence and some have been debunked completely. One significant factor limiting their study is they are often found in places that are difficult to access and are inhospitable. Locating the 263 different sites of “fairy circles” involved analysing high-resolution satellite imagery. Guirado and his team wrote in their paper: “[The sites] include those already identified in Namibia and Western Australia, as well as areas never described before, including the Sahel, Western Sahara, Horn of Africa, Madagascar, Southwest Asia, or Central and Southwest Australia. “By doing so, our study provides a global atlas of areas showing FC-like vegetation patterns and expands the known existence of this vegetation type to new countries and continents.” The team hopes that locating new sites will enable them to find common traits that may point towards their cause. Sign up to 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.

As China's housing crisis grows, so have fears that dreams of home ownership have been bulldozed.

People can go years with no idea they have something wrong with their heart. Symptoms can be vague and subtle and many heart conditions are ‘hidden’ – meaning they’re not obvious from the outside. “Hidden heart conditions often go undiagnosed for too long, until something goes wrong or it’s too late,” says Sindy Jodar, senior cardiac nurse at the British Heart Foundation (BHF). “That’s why it is important to never ignore the signs of heart disease and get yourself checked, just to be sure.” While some warning signs are easy to spot – such as severe chest pain and collapse – there are also many little indicators that something could be wrong with your heart or circulatory system. These won’t necessarily mean you have a heart problem, but it’s always best to have them investigated. From tiredness and nausea to fainting, here are some of the less obvious symptoms everyone needs to know about… 1. Feeling unusually tired Dr M Adil U Khan, a GP at Pall Mall Medical, says you should not “ignore or downplay unusual levels of tiredness”. While it’s normal to feel exhausted if you’ve been very busy or lacking sleep, he adds: “Feeling unusually tired, especially if it’s not related to exertion, should be investigated.” It could be due to something like anaemia, a virus, or even linked to mental health. It could also be related to your heart, so it is important to have it investigated. 2. Subtle discomfort “Look out for subtle discomfort in different areas of your body, including discomfort or pain in the jaw, neck, back, or stomach, which can be associated with a heart problem,” says Khan. If symptoms are out of the norm for you and aren’t going away, it’s always best to get them checked. 3. Unusual swelling Perhaps you have noticed your ankles look particularly puffy, or maybe it’s your general tummy area that’s constantly swollen for no apparent reason. “Unexplained swelling, known as oedema, in the legs, ankles or abdomen, may also be signs of heart failure,” explains Khan. 4. Vomiting and a choking sensation Sudden vomiting or a choking sensation in your throat is something to be wary of too. “While not every bout of nausea means there could be something serious happening, feeling sick combined with other aches and pains, such as severe chest pain, should ring an alarm bell,” says Jodar. Yes, it could be a stomach bug, but if you are having sudden spells of vomiting and nausea more regularly and you’re not sure why, don’t delay in get things checked out. 5. Fainting If you experience sudden fainting, this is a big indicator of something being awry. “If fainting or any other symptom becomes a problem, consult a healthcare provider and schedule an appointment with a doctor or cardiologist,” says Khan. “Discuss your symptoms, medical history and risk factors with them. “Your healthcare provider will assess your vital signs and perform a physical examination. Depending on your symptoms and risk factors, you may undergo diagnostic tests like ECGs, echocardiograms, stress tests, blood tests, or more specialised cardiac assessments,” he adds. 6. Shortness of breath Struggling to catch your breath is not a trivial matter. “Anyone experiencing shortness of breath during everyday activities or at rest should see their doctor,” says Khan. This is especially the case if it’s accompanied by chest pain – even if it doesn’t seem especially severe. Khan adds: “Mild chest discomfort should always be investigated, but some people mistake this for indigestion or muscular pain.” 7. Unusual sweating “Feeling hot, clammy and quite sweaty when you haven’t been doing strenuous exercise shouldn’t be ignored,” adds Jodar. “If this is combined with chest pains, it’s important you get yourself looked at.” 8. Heart rate irregularities Does your pulse sometimes feel jumpy or too fast? Get it checked with your doctor. Khan says: “Smartwatches and fitness trackers can provide valuable data about your heart rate and may detect irregularities to some extent. They can help track general trends in heart rate, especially during physical activity or rest. “However, they are not a substitute for medical-grade monitoring and evaluation… Any concerning symptoms should be evaluated by a healthcare professional for a comprehensive assessment and diagnosis,” Khan adds. Read More Charity boss speaks out over ‘traumatic’ encounter with royal aide Ukraine war’s heaviest fight rages in east - follow live Breast Cancer Awareness Month: 9 brilliant beauty buys supporting good causes Smokers 2.6 times more likely to give birth prematurely Female students ‘more than twice as likely’ to be affected by poor mental health, research shows

The 6,000 year old woven sandals are among dozens of prehistoric objects being analysed by scientists.

BANGKOK An interest rate hike by Thailand's central bank this week was designed to anchor inflation, its governor

Thailand's golden beaches, shopping districts and ornate temples are filling with tourists once again and Chinese vacationers are getting an especially VIP welcome under a new visa-free scheme.

After Bryce Harper's ejection, a heartwarming twist unfolded as a 10-year-old fan caught his helmet in the crowd. Instead of asking for it back, Harper chose to autograph the helmet for the young fan.

The Portland Trail Blazers are expected to trade Jrue Holiday to a big-name contender, but these teams under the radar should make a real push for the All-Star.

Angel Hernandez made a terrible call then ejected Bryce Harper for arguing it.

In an interview with FanSided's 'Stacking the Box' podcast, New York Giants legend Eli Manning reflected on the most memorable play of his career.

The US wants to find those behind the killing of presidential candidate Fernando Villavicencio last month.