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A cryptic chemical signature of unknown origins, hidden for centuries inside the trunks of Earth’s trees, just became even more mysterious. In the last decade, scientists have discovered traces on Earth of six intense bursts of radiation, known as Miyake events, scattered over the last 9,300 years. The most popular explanation is that these mysterious signatures were left behind by massive solar s
What’s remarkable is not only that mid-20th century psychology textbook writers and publishers fabricated significance testing out of a mishmash of conflicting statistical techniques (SN: 6/7/97). It’s also that their weird creation was embraced by many other disciplines over the next few decades. It didn’t matter that eminent statisticians and psychologists panned significance testing from the st
Space station detectors found the source of weird ‘blue jet’ lightning A ‘blue bang’ sparks an unusual type of lightning in the upper atmosphere The International Space Station spotted an exotic type of upside-down lightning called a blue jet (illustrated) zipping up from a thundercloud into the stratosphere in 2019. DTU Space, Daniel Schmelling/Mount Visual Scientists have finally gotten a clear
COVID-19 may be most contagious one to two days before symptoms appear More than 4 in 10 coronavirus cases are spread by those not obviously sick, a study suggests SARS-CoV-2, the coronavirus that causes COVID-19, appears to be most contagious at the start of an infection, before people even know they have it. Here, the virus (yellow) is shown infecting a dying cell (blue) from a COVID-19 patient.
DENVER — A superheated blast from the skies obliterated cities and farming settlements north of the Dead Sea around 3,700 years ago, preliminary findings suggest. Radiocarbon dating and unearthed minerals that instantly crystallized at high temperatures indicate that a massive airburst caused by a meteor that exploded in the atmosphere instantaneously destroyed civilization in a 25-kilometer-wide
New technique produces real randomness ‘Extractor’ removes predictability from computer-generated numbers NO DICE For computers, generating random numbers is more complex than a simple roll of the dice. Computer scientists have devised an easier way for computers to harvest randomness from their environment. James Bowe/Flickr (CC BY 2.0) Ask a computer to pick a random number and you’ll probably g
A copy of the Mona Lisa in the Prado Museum (left) is painted from a slightly different perspective than the original in the Louvre (right). Together, the paintings make a stereoscopic image — whether da Vinci knew that or not. Leonardo da Vinci was, to put it mildly, a smart guy. He was an inventor and scientist as well as an artist, and he took a special interest in finding ways to realistically
Poverty drains brains while it empties pocketbooks, a new study concludes. Money worries consume poor people’s attention, dramatically undermining their performance on IQ-related tests of reasoning and mental control, say economist Anandi Mani of the University of Warwick in Coventry, England, and her colleagues. Among the poor, but not the rich, evoking financial concerns damages reasoning abilit
Elevated carbon dioxide may impair reasoning Insufficient ventilation allows exhaled gas to build up indoors, diminishing decision-making abilities Carbon dioxide has been vilified for decades as a driver of global warming. A new study finds signs that CO2, exhaled in every breath, can exert an equally worrisome threat — impaired cognition — in nearly every energy-efficient classroom, meeting hall
Think too hard about it, and mathematics starts to seem like a mighty queer business. For example, are new mathematical truths discovered or invented? Seems like a simple enough question, but for millennia, it has provided fodder for arguments among mathematicians and philosophers. Those who espouse discovery note that mathematical statements are true or false regardless of personal beliefs, sugge
Knotted threads secure buttons to shirts. Knots in ropes attach boats to piers. You can find knots in shoestrings, ties, ribbons, and bows. But even without Boy Scouts or sailors, knots would be everywhere. CATALOG OF COILS. Ropes knotted up spontaneously when tumbled in a box. Each knot (off-white) example is paired with the corresponding idealized knot (gold). Raymer/UCSD KNOTS HAPPEN. Computer
Physics The world’s fastest microscope makes its debut Using a laser and an electron beam, the microscope can snap images of moving electrons every 625 quintillionths of a second.
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