Solution: We are going to view the lock wheels as a counter from 0 to 999. We reset it to 000 at the beginning. We view the leftmost wheel as the hundreds place, the second from leftmost wheel as the tens place, and the rightmost wheel as the ones place. Take the top glyph and put it on the center of the desk. Set the counter to 1 (001 read from left to right)....
Mammals run hot. The ability to maintain an elevated, constant body temperature—known scientifically as endothermy and colloquially as warm-bloodedness—is a critical part of what has allowed these beasts to adapt to many different habitats, from polar seas to searing deserts. Exactly when mammals evolved this ability, however, has long been a mystery. Finding direct evidence of how ancient organisms’ physiology worked is a challenging task. The soft tissues that would be the most informative about warm- or cold-bloodedness are rarely preserved in fossils, and paleontologists obviously cannot directly measure an extinct animal’s body temperature....
After years of being stymied in their quest to define a long-range strategy for dealing with climate change, Democrats suddenly find themselves in the position of doing just that. Yesterday, they were given a road map. A report released by an influential group of scientists and other experts paints a picture that is full of optimistic proposals. It envisions the United States carefully building a political and technical foundation over the next 10 years for reaching net-zero emissions between now and 2060....
After looming above the Arctic for nearly a month, the single largest ozone hole ever detected over the North Pole has finally closed, researchers from the European Union’s Copernicus Atmosphere Monitoring Service (CAMS) reported. “The unprecedented 2020 Northern Hemisphere ozone hole has come to an end,” CAMS researchers tweeted on April 23. The hole in the ozone layer—a portion of Earth’s atmosphere that shields the planet from ultraviolet radiation—first opened over the Arctic in late March when unusual wind conditions trapped frigid air over the North Pole for several weeks in a row....
For the second year in a row, the Arctic is facing a late December heat wave (at least by Arctic winter standards). Temperatures are forecast to soar about 50°F above normal, which would bring them near the freezing point at the North Pole. As isolated data points, the back-to-back winter warm-ups would be weird. But taken in the larger context, it’s part of anunsettling trend for a region that is being rapidly reshaped by climate change....
As the 61st minute of the 2019 Women’s World Cup Final between the U.S. and the Netherlands began, Megan Rapinoe stood at the edge of the penalty box, stoically awaiting the referee’s whistle. An hour of attack and counterattack in the sweltering heat and under the anxious gaze of tens of thousands of fans had exhausted both sides but had yet to produce a goal for either. At the sound of the whistle, Rapinoe took a centering breath, trotted forward and skipped the ball into the back of the net, breaking the tie....
A panel of experts in preventive medicine released a draft proposal Tuesday on screening for prostate cancer. “Another one?” you may ask, remembering an earlier recommendation. Don’t worry; we’re here to help you avoid whiplash: What’s new? What was emphatic before is wishy-washy now. The last time the US Preventive Services Task Force weighed in on prostate cancer screening via blood tests, in 2012, it issued unambiguous advice to physicians: discourage men of all ages from getting tested for levels of prostate-specific antigen (PSA)....
EARLY GESTALT psychologists—including Stuart Anstis of the University of California, San Diego, and the late Hans Wallach—were intrigued by what they referred to as the Barber Pole Illusion (a). A vertical cylinder with spiraling red and white stripes painted on its surface is made to spin on its long axis. Even though the stripes are actually moving horizontally, around the pole, they appear to move vertically (up or down the pole, depending on direction of spin)....
It may seem silly to fear a little spider—but the predator’s appearances in horror movies make more sense when you consider the precision, skill and creativity it employs to target its prey. Spiders’ venom-injecting fangs and the pointy claws tipping their segmented legs are menacing enough, but their innovative use of silk to ensnare victims may be the biggest reason to be grateful they are small. “They’re absolute masters of using silk,” says Paul Selden, an arachnologist and paleontologist at the University of Kansas....
Modern heart surgery is miraculous. To think a failing aortic valve can be replaced via catheter without even cutting open the chest is to appreciate one of the wonders of 21st-century medicine. But as two recent landmark studies suggest, we may be a bit too avid for cardiac procedures. When it comes to treating some common heart conditions, medication can often get the job done. That was the lesson of the much anticipated ISCHEMIA trial, the results of which were revealed at last November’s meeting of the American Heart Association....
Languages around the world share universal principles that transcend grammar or words, according to recent data collected by globe-trotting linguists. By learning different languages and analyzing conversations, these researchers are beginning to identify social cues shared by the speakers of numerous different language groups. People all over the world use a pregnant pause, for example, or a well-timed “huh?” to convey their thoughts and feelings. Mark Dingemanse and Nick Enfield, both linguists at the Max Planck Institute for Psycholinguistics, suggest that such evidence might form a social foundation on which all languages are built....
Much of what happens to you in the hospital in the name of diagnosing and healing is invasive. Depending on what ails you, a doctor may need to ream out an artery to get more blood to your heart, or flood your body with a poison to kill cancerous cells, or saw through the bones of your leg to replace a crumbling hip or a worn-out knee. If a stranger came at you with a scalpel or syringe in a back alley, you would consider it assault and battery....
The following essay is reprinted with permission from The Conversation, an online publication covering the latest research. On July 21, 2022, U.S. President Joe Biden said he had tested positive for COVID-19 and was experiencing mild symptoms. In a letter to the public, Biden’s doctor explained that the president had a slight runny nose, some fatigue and the occasional dry cough, and that Biden had already begun taking the antiviral drug Paxlovid....
Last week, we talked about our love of sugar and I explained some of the reasons why we humans develop certain traits that seem contrary to our survival. This week, I thought we’d dig into why we develop some traits that aren’t so much contrary to our survival but may seem unnecessary. Specifically, why do we laugh? People from all cultures laugh, although we may laugh at different things. (I once interviewed for a job in the Netherlands and none of my jokes landed....
Whether you call them feral pigs, boar, swine, hogs, or even razorbacks, wild pigs are one of the most damaging invasive species on Earth, and they’re notorious for damaging agriculture and native wildlife. A big reason they’re so harmful is because they uproot soil at vast scales, like tractors ploughing a field. Our new research, published today, is the first to calculate the global extent of this and its implications for carbon emissions....
Neurodegenerative diseases all involve the accumulation of toxic versions of naturally produced proteins in the brain. Multiple proteins are often abnormal in a patient, and the same aberrant protein can be involved in several different conditions. One common culprit is tau, which is abnormal in various conditions: chronic traumatic encephalopathy, a neurodegenerative disorder caused by repeated head trauma; a group of conditions known collectively as frontotemporal dementia; and, most famously, Alzheimer’s disease (AD)....
High prices for gasoline and home heating oil are here to stay. The U.S. is at war in the Middle East at least in part to protect its foreign oil interests. And as China, India and other nations rapidly increase their demand for fossil fuels, future fighting over energy looms large. In the meantime, power plants that burn coal, oil and natural gas, as well as vehicles everywhere, continue to pour millions of tons of pollutants and greenhouse gases into the atmosphere annually, threatening the planet....
The Conversation, an online publication covering the latest research. In the eyes of many Americans, the Fourth of July is a day for parades, barbecue and, of course, fireworks. The tradition got its start at the beginning of our nation’s history after the Founding Fathers met in Philadelphia to write and sign the Declaration of Independence. A day after the Continental Congress adopted the declaration on July 4, 1776, John Adams – soon the second U....
In the years leading up to the roaring 2020s, young people were once again dropping acid. Onetime Harvard psychologist Timothy Leary died almost 25 years ago, after which some of his ashes were launched into space. But from 2015 to 2018, the rate of “turning on and tuning in” with LSD, to paraphrase Leary, increased by more than 50 percent in the U.S.—a rise perhaps fueled by a need for chemical escapism....
My Scientific American column this month is a page-long gasp of amazement at the potential of ResearchKit, Apple’s new open-source tool kit for writing medical research apps. It has the potential to turn tiny, inefficient, limited medical studies into large, immediate, international ones. A handful of institutions introduced five ResearchKit apps when the initiative launched this April. (Apple, which does not receive the collected data, collaborated on creating each of these free apps....
