Happy Birthday, Periodic Table!

YouTube // Crash Course
YouTube // Crash Course

On March 6, 1869, Dmitri Mendeleev unveiled a remarkable discovery-slash-invention: the periodic table arranging the known elements. He showed it to the Russian Chemical Society, and chemistry was forever changed.

Mendeleev's discovery had profound implications. By arranging the elements mostly according to their atomic weight, noting that various periodic relationships occurred among elements, and grouping related elements together, Mendeleev's table predicted useful information about elements that had not yet been discovered. Although only 60 elements were on that original table, we can draw a straight line from Mendeleev's work to the periodic table we see everywhere today. (Note: Mendeleev's table was very text-heavy; the modern boxy design we know came about starting in the 1920s when Horace Deming drew it up.)

So how did Mendeleev come to create his periodic table, and how did it help chemists? Hank Green taught a great Crash Course Chemistry lesson about the whole thing, starting with Mendeleev's childhood. Settle back for 10 minutes, and learn a bit about something we often take for granted.

If you're looking for a shorter introduction, check out this TED-Ed lesson. You might also be interested to know that German chemist Julius Lothar Meyer independently discovered the same thing in 1870, after working on a similar idea for years. So it goes.

You Can Now Go Inside Chernobyl’s Reactor 4 Control Room

bionerd23, YouTube
bionerd23, YouTube

The eerie interior of Chernobyl’s Reactor 4 control room, the site of the devastating nuclear explosion in 1986, is now officially open to tourists—as long as they’re willing to don full hazmat suits before entering and undergo two radiology tests upon exiting.

Gizmodo reports that the structure, which emits 40,000 times more radiation than any natural environment, is encased in what's called the New Safe Confinement, a 32,000-ton structure that seals the space off from its surroundings. All things considered, it seems like a jolly jaunt to these ruins might be ill-advised—but radiology tests are par for the course when it comes to visiting the exclusion zone, and even tour guides have said that they don’t usually reach dangerous levels of radiation on an annual basis.

Though souvenir opportunists have made off with most of the plastic switches on the machinery, the control room still contains original diagrams and wiring; and, according to Ruptly, it’s also been covered with an adhesive substance that prevents dust from forming.

The newly public attraction is part of a concerted effort by the Ukrainian government to rebrand what has historically been considered an internationally shameful chapter of the country's past.

“We must give this territory of Chernobyl a new life,” Ukraine's president Volodymyr Zelensky said in July. “Chernobyl is a unique place on the planet where nature revives after a global man-made disaster, where there is a real 'ghost town.' We have to show this place to the world: scientists, ecologists, historians, tourists."

It’s also an attempt to capitalize upon the tourism boom born from HBO’s wildly successful miniseries Chernobyl, which prompted a 35 percent spike in travel to the exclusion zone earlier this year. Zelensky’s administration, in addition to declaring the zone an official tourist destination, has worked to renovate paths, establish safe entry points and guidelines for visitors, and abolish the photo ban.

Prefer to enjoy Chernobyl’s chilling atmosphere without all the radioactivity? Check out these creepy photos from the comfort of your own couch.

[h/t Gizmodo]

Invasive Snakehead Fish That Can Breathe on Land Is Roaming Georgia

Mohd Fazlin Mohd Effendy Ooi, Flickr // CC BY 2.0
Mohd Fazlin Mohd Effendy Ooi, Flickr // CC BY 2.0

A fish recently found in Georgia has wildlife officials stirred up. In fact, they’re advising anyone who sees a northern snakehead to kill it on sight.

That death sentence might sound extreme, but there’s good reason for it. The northern snakehead, which can survive for brief periods on land and breathe air, is an invasive species in North America. With one specimen found in a privately owned pond in Gwinnett County, the state wants to take swift action to make certain the fish, which is native to East Asia, doesn’t continue to spread. Non-native species can upset local ecosystems by competing with native species for food and habitat.

The Georgia Department of Natural Resources’ Wildlife Resources Division is advising people who encounter the snakehead—a long, splotchy-brown fish that can reach 3 feet in length—to kill it and freeze it, then report the catch to the agency's fisheries office.

Wildlife authorities believe snakeheads wind up in non-native areas as a result of the aquarium trade or food industry. A snakehead was recently caught in southwestern Pennsylvania. The species has been spotted in 14 states.

[h/t CNN]

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