A Very Small Holiday Gesture

The card’s cover features a jolly-looking snowman. The message “Season’s Greetings” runs beneath it.

The U.K.’s National Physical Laboratory has crafted the smallest Christmas card in the world, which is so tiny that 200 million of them would fit in one postage stamp.

h/t: CNET


The Humming Earth

We think of Earth as solid as a billiard ball and as still as a statue. But that’s a false notion.

Our planet is in ceaseless motion, even though we don’t feel it. It’s continually spinning—at a speed of 1,070 m.p.h.—and the ground beneath our feet is vibrating non-stop.

In fact, it’s “ringing like a bell all the time,” a researcher told the Washington Post. But that ringing is so feeble that our ears can’t pick it up. Hovering between 2.9 and 4.5 millihertz, the frequency is 10,000 times lower than our audible range, which starts at around 20 hertz.

This “hum” is everywhere, even at the bottom of the ocean.

h/t: WP

Foreign, Science

A Hole In The Heart Of The Great Pyramid

The oblong cavern is located above the Grand Gallery (a long inclined passageway that leads to the King’s Chamber.)

There’s a hidden “void” inside the Great Pyramid of Giza, “a space 100 feet long, similar to the Statue of Liberty from her heel to her head.”

A team of researchers got a picture of it, employing a technique from the field of particle physics. Standing in the Queen’s chamber, they sent a beam of muons—heavier siblings of electrons that can penetrate rocks—through the pyramid.

As muons pass through matter, they lose energy and decay. So, if they were enfeebled, it’d mean that they’d passed through solid matter; if they stayed strong, it’d suggest that they’d traveled through empty space or less dense material.

When the data was analyzed, it revealed an unexpected excess of muons, indicating the latter. But it’s not known if the cavern they detected is a chamber, a tunnel, or an enormous gallery, but its steep incline makes it unlikely that it was a room of some sort.

h/t: NYT