Earth's Magnetic Field Flipped 42,000 Years Ago. The Consequences Were Dramatic. A global period of upheaval 42,000 years ago was the result of a reversal in Earth's magnetic field, new research has found.
According to radiocarbon preserved in ancient tree rings, several centuries' worth of climate breakdown, mass extinctions, and even changes in human behaviour can be directly linked to the last time Earth's magnetic field changed its polarity. The research team has named the period the Adams Transitional Geomagnetic Event, or Adams Event, after sci-fi writer Douglas Adams, who famously declared the number 42 the ultimate answer to life, the Universe, and everything. "For the first time ever, we have been able to precisely date the timing and environmental impacts of the last magnetic pole switch," said Earth scientist Chris Turney of the University of New South Wales in Australia. An Old Rat With No Brain Raises Some Very Interesting Questions.
Yes, R222 was only a rat.
A rat that turned out to have no brain. But here’s the thing: R222 had lived a normal life as a lab rat for two whole years. Scientists Reveal Strange Molecule That Can Store Sun's Energy For 18 Years. One of the biggest hurdles to widespread adoption of renewables is energy storage.
Where do you store energy when the sun's not shining, the wind's not blowing, etc.? A Swedish research team believes it found the breakthrough renewables was looking for, a solar thermal fuel that can store the sun's energy for up to 18 years. Hydrocarbons, in part, became the world's dominant energy source because they are relatively cheap to extract, can be stored for long periods of time, and can be utilized immediately.
These factors make it a great source for energy to power on-demand. As batteries continue to develop in their capacity to store energy and for long periods of time, they have begun to supplant hydrocarbons, i.e. electric vehicles. As an alternative to batteries, the specialized solar thermal fluid can hold the sun's energy for long periods of time and expel that energy on demand. UN Says Climate Genocide Coming. But It’s Worse Than That. You now have permission to freak out.
Photo: George Rose/Getty Images Just two years ago, amid global fanfare, the Paris climate accords were signed — initiating what seemed, for a brief moment, like the beginning of a planet-saving movement. But almost immediately, the international goal it established of limiting global warming to two degrees Celsius began to seem, to many of the world’s most vulnerable, dramatically inadequate; the Marshall Islands’ representative gave it a blunter name, calling two degrees of warming “genocide.” The alarming new report you may have read about this week from the UN’s Intergovernmental Panel on Climate Change — which examines just how much better 1.5 degrees of warming would be than 2 — echoes the charge.
“Amplifies” may be the better term. If you are alarmed by those sentences, you should be — they are horrifying. Because the numbers are so small, we tend to trivialize the differences between one degree and two, two degrees and four. It is. Fiche technique : la perruche Calopsitte. La perruche calopsitte est un oiseau de compagnie très conseillé pour les débutants et fortement apprécié pour ses qualités nombreuses.
Vous trouverez dans cette fiche technique des informations principales et des conseils de base sur la perruche calopsitte. Quel entretien demande une perruche calopsitte ? Comment nourrir une perruche calopsitte ? Comment se déroule sa reproduction ? Facts About African Grey Parrots. Les ondes gravitationnelles ont été détectées, Einstein avait raison. Des équipes internationales de chercheurs ont annoncé jeudi la première détection directe d'ondes gravitationnelles, une avancée jugée majeure en physique qui ouvre une nouvelle fenêtre sur l'univers et ses mystères, notamment les trous noirs (lire nos explications ici).
Cette découverte, qui couronne plusieurs décennies d'efforts, confirme une prédiction importante de la théorie de la relativité générale d'Albert Einstein énoncée en 1915. Une découverte inédite. Les ondes gravitationnelles sont produites par de légères perturbations subies par la trame de l'espace-temps sous l'effet du déplacement d'un objet de grande masse. Elles se propagent à la vitesse de la lumière et rien ne les arrête. Sciencemag. For decades, researchers seeking the origin of our species have scoured the Great Rift Valley of East Africa.
Now, their quest has taken an unexpected detour west to Morocco: Researchers have redated a long-overlooked skull from a cave called Jebel Irhoud to a startling 300,000 years ago, and unearthed new fossils and stone tools. The result is the oldest well-dated evidence of Homo sapiens, pushing back the appearance of our kind by 100,000 years. “This stuff is a time and a half older than anything else put forward as H. sapiens,” says paleoanthropologist John Fleagle of the State University of New York in Stony Brook.
The discoveries, reported in Nature, suggest that our species came into the world face-first, evolving modern facial traits while the back of the skull remained elongated like those of archaic humans. The findings also suggest that the earliest chapters of our species’s story may have played out across the African continent. Microbialite Stock Images, Royalty-Free Images & Vectors. Utah’s Great Salt Lake Contains Scores of Living Rocks.