A subterreanean military complex built in 1916 is finally coming to light.
A cranking surf break can sustain an entire economy, while the loss of one causes economic growth to shrink. A study of more than 5000 high-quality surf breaks in 146 countries, conducted by Sam Wills of the University of Sydney, suggests that once a break becomes known to surfers internationally, economies in those locations grow up to 2.2 GDP percentage points more per year than the global average. Wills looked at satellite photos of surf locations taken at night between 1992 and 2013, treating growth of the lit-up areas as equivalent to economic growth. Well-known surf breaks can boost surrounding economies if better technology is invented to ride them, such as battery-heated wetsuits for cold locations, for instance, or if waves improve due to an El Niño event. Policy-makers could use natural amenities such as surf breaks as engines for growth, especially in developing countries, says Wills, as long as the environment is protected. The destruction of a surf break by seawalls or other modifications can send an economy downhill, the study found. Jardim do Mar in Portugal and Mundaka in Spain, saw a fall in growth after their breaks disappeared due to coastal modification.
Teenagers are stereotyped as being fiercely independent and rejecting the status quo, but having a sense of community belonging is in fact critical to their happiness.
Freshwater rises above denser saltwater—except in Antarctica, where the rotation of the earth keeps Antarctic meltwater hundreds of metres below the surface of the ocean. Research published in Nature earlier this year investigated meltwater gushing from an underwater cave in the Pine Island Glacier, which is particularly fast-melting. Although this freshwater begins to rise vertically, the rotation of the earth causes the stream of meltwater to spin on its vertical axis, flinging the freshwater sideways in filaments, which then mix with saltwater and settle at depth. This type of motion is widespread at the poles, say the University of Southampton researchers. Ice sheets form fastest when meltwater rises to the surface of the sea, remains there and freezes in place. Without a layer of freshwater on top of the ocean, saltwater continually rises to the surface of the ocean and sinks, this churning motion preventing it from freezing as quickly. Without ice sheets forming at their usual pace, the melting of the poles may take place faster than currently predicted.
When the plant pathogen Pseudomonas syringae, or PSA, first infected New Zealand kiwifruit vines in 2010, it moved quickly. More than three-quarters of kiwifruit orchards caught the disease. How did it spread? As researchers at MIT found, it could have hitched a ride on water aerosols—clouds of microscopic particles created during rain. When light or moderate rain falls on sandy or clay soil, bubbles of air are trapped beneath individual raindrops. As soil bacteria infiltrates the raindrop, air bubbles rise through the droplet and pop, sending a fine mist of water aerosols into the air, carrying thousands of bacteria with them. MIT researchers studied the aerosol-propelled movement of Pseudomonas syringae and two other bacteria, Corynebacterium glutamicum and Bacillus subtilis—and found that all three stayed alive for more than an hour, meaning they could travel long distances—especially if the aerosols were caught in a breeze. Up to a quarter of global soil bacteria could be transported in this way, say the study’s authors.
A pā in the Waikato has been dated back to 1768 AD—younger than previously thought—using a precise form of radiocarbon dating never before applied to pā. About 7000 pā have been identified across New Zealand. Some are the area of a modern-day house, others span hectares, and many are in the lush areas of the northern half of the North Island now used for farming. Many pā in the Waikato were swamp pā, which took advantage of navigable waterways and rich natural resources. In the case of the 6000-square-metre Otāhau Pā, built on a strip of land between the Komakorau and Mangamotu streams near the Waikato River, the boggy soil and stream has preserved the palisade posts, 100 of which are still visible above water. Some of the posts were the trunks of mīro, a winner in terms of carbon dating because of its sharp, clear growth rings that can be cut out and measured for radiocarbon. Radiocarbon, along with regular carbon, is incorporated from the atmosphere into living creatures and plants. When the creatures and plants die, the radiocarbon will slowly decay to nitrogen—so the ratio of remaining radiocarbon to regular carbon tells researchers how old the artefact is. But regular radiocarbon dating often isn’t precise enough because there have been natural fluctuations of radiocarbon in the atmosphere throughout history. In a technique called ‘radiocarbon wiggle-matching’, the radiocarbon amounts in individual tree rings of the pā palisade post are compared with the radiocarbon amounts in tree rings of a kauri of known calendar age, and so a more precise date is reached. With this most recent study, by Alan Hogg and his team from the University of Waikato, wiggle-matching could date the palisade post construction to within four years. The authors write in the Journal of Archeological Science Reports that the pā is much younger than was expected by kaumātua from Taupiri Marae, 1.5 kilometres from Otāhau Pā. There is not much oral history on the pā from that time period, and as the area was in a state of warfare, they suggest that it may have been settled by another hapū.
A new species of Samoan beetle has been discovered, long after it became extinct.
Seabirds are gorging on plastic for a simple reason: it smells like food.
Cement was considered a climate risk, but a new study shows it isn’t as bad as once suspected.
A Fijian ant cultivates its own garden, and can’t survive without it.
Scientists discover ‘snow’ 4000 metres under the sea, and it powers much of life in the vast abyss.
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