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.