How Does a Virus Spread in Cities? It’s a Problem of Scale

How Does a Virus Spread in Cities? It’s a Problem of Scale

And on the flip side, New Orleans, with a population density of 431 people per square kilometer, reports 1,718 cases per 10,000.Or here’s another way to look at it: According to data assembled by the Financial Times, New York City has experienced a 408 percent increase in deaths from all causes since the beginning of the pandemic.

The Top 3 Rugged Cameras for Daredevil Shooters

The Top 3 Rugged Cameras for Daredevil Shooters

Ricoh's latest entoughened camera has special modes for optimizing colorful foliage and pristine snowy vistas, but it loves getting up close too.

13 Great Tech Deals: Cameras, Laptops, Watches, and More

13 Great Tech Deals: Cameras, Laptops, Watches, and More

Whether you're looking to step up from your phone to a still-pocketable point-and-shoot or want to go full-frame DSLR, there are deals for you.The camera's 1-inch sensor is on par with some of the best compact cameras and features 4K video and a great touchscreen interface.

The Notre Dame Fire Spread Toxic Lead Dust Over Paris

The Notre Dame Fire Spread Toxic Lead Dust Over Paris

On May 13—almost a month after the fire—the city of Paris first tested lead levels at schools and kindergartens near the cathedral, apparently informing principals in the affected area that there was no significant health risk.

Choosing the Wrong Lane in the Race to 5G

Choosing the Wrong Lane in the Race to 5G

The United States, however, has made zero mid-band spectrum available at auction for the 5G economy. For the United States to have secure 5G service available to everyone, everywhere, we need to stop going at it alone with millimeter wave spectrum.

A Shocking Find Shows Just How Far Wind Can Carry Microplastics

A Shocking Find Shows Just How Far Wind Can Carry Microplastics

You might assume a film with more surface area would travel farther than a fragment, but that just hasn’t been tested.“That's one of the challenges moving forward is trying to actually model how these plastics move in 3D in the air, so we can figure out where they come from,” says environmental pollution scientist Deonie Allen of the EcoLab, part of the National Center of Scientific Research for France, coauthor on a new paper in Nature Geoscience.

The Loopy Secrets of How Charging Cables Work

The Loopy Secrets of How Charging Cables Work

To light the bulb, I just need to pick two of these wires so that I can make a complete circuit with the battery and let current flow through the filament. The voltmeter, like just about every electrical measuring device, needs to have a complete circuit.

Apple Has Blocked Google's Internal Apps, Too

Apple Has Blocked Google's Internal Apps, Too

"The Screenwise Meter iOS app should not have operated under Apple’s developer enterprise program—this was a mistake, and we apologize,” a Google spokesperson said in a statement Wednesday.

One Square Meter of Prairie

One Square Meter of Prairie

Photo © Chris Helzer / TNC I was thrilled to photograph two different monarch butterflies inside the plot, the more so because of their current population declines.

Super-Fast Airport Scanners Are Coming—Eventually

Super-Fast Airport Scanners Are Coming—Eventually

It has installed a system at the Oakland Airport in California, not for passengers, but to screen employees as they come to work on the sensitive “air side” of operations, or as they move backward and forward several times a day from "land side." Evolv’s millimeter-wave scanners look like bulked-up versions of the beepy theft-prevention gates near the doors of some stores, and they can grab an image in a fraction of a second, as opposed to a more typical two seconds.

Galileo, Krypton, and How the True and Accurate Meter Came to Be

Galileo, Krypton, and How the True and Accurate Meter Came to Be

By way of Galileo’s simple observation so length and time were seen to be linked—a linkage that made it possible that a length could be derived not simply from the dimensions of limbs and knuckles and strides, but by the hitherto quite unanticipated observation of the passage of time.From the book The Perfectionists: How Precision Engineers Created the Modern World by Simon Winchester.HarperA century later an English divine, John Wilkins, proposed employing Galileo’s discovery to create an entirely new fundamental unit, one that had nothing to do with the then-traditional standard in England, which was a rod that was more or less officially declared to be the length of a yard.

Watch Live: NASA OSIRIS-REx Arrives at Asteroid Bennu

Watch Live: NASA OSIRIS-REx Arrives at Asteroid Bennu

Watch Live: NASA OSIRIS-REx Arrives at Asteroid BennuIf NASA is successful, Bennu will become the smallest object the agency has ever orbited.NASA Goddard Space Flight CenterTwo years and two months after it launched from Cape Canaveral Air Force Station, NASA's $800-million mission to the asteroid belt between Mars and Jupiter will reach a pivotal moment Monday, when the agency's OSIRIS-REx spacecraft is slated to rendezvous with its scientific target: a dark, round, carbon-rich asteroid named Bennu.At fewer than 500 meters in diameter, Bennu is a small solar-system body with big scientific potential: Astronomers suspect the asteroid's rocky composition has remained more or less unchanged since it formed some 4.5 billion years ago.

Trump's Apparent Aquaphobia Tops This Week's Internet News Roundup

Trump's Apparent Aquaphobia Tops This Week's Internet News Roundup

Indeed, a lot of what people were talking about last week—Melania Trump's verion of "you're fired" and pro wrestling debacles aside—were events set in motion at various points in the past.

How to Easily Locate the Accelerometer in an iPhone

How to Easily Locate the Accelerometer in an iPhone

Moving in a circle at a constant speed means there is indeed an acceleration.If we have an object moving in a circle, the acceleration is pointed towards the center of the circle and depends on two things: the angular velocity (ω) and the circular radius (r).

98.6 Degrees Is a Normal Body Temperature, Right? Not Quite

98.6 Degrees Is a Normal Body Temperature, Right? Not Quite

And it is lowest in the morning."A temperature of 99 at six o’clock in the morning is very abnormal, whereas that same temperature at four o’clock in the afternoon can be totally normal," says Jonathan Hausmann, a rheumatologist at Boston Children’s Hospital and Beth Israel Deaconess Medical Center in Boston, who gathered 11,458 temperatures in crowdsourced research using an iPhone app called Feverprints.The study, published online this month in the Journal of General Internal Medicine, refutes the age-old benchmark of 98.6 degrees Fahrenheit.