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Lucy Stockton/National Trust Images
Lucy Stockton/National Trust Images

The Tiny, Pretty Diamond Spider Isn't Extinct After All

Lucy Stockton/National Trust Images
Lucy Stockton/National Trust Images

An elusive spider that was believed to be extinct in Britain has been spotted for the first time in nearly 50 years, according to The Telegraph.

Pretty little Thanatus formicinus—more commonly known as the diamond spider—is just a third of an inch long and gets its name from the thin black diamond on its hairy gray abdomen. The spider typically lives in damp areas with moss and flowering plants, like heather and purple moor grass. But since the arachnid was last spotted in England’s Ashdown Forest in 1969, conservationists assumed that it had fallen victim to habitat loss.

Turns out, the spider wasn’t extinct—it was just laying low for a few decades. While conducting an ecological survey of Clumber Park—an expanse of heath, woods, and parkland in Nottinghamshire—two volunteers with England’s National Trust conservation organization recently spotted the long-lost arachnid.

“The spider ran away from me twice, but with persistence and some luck, I caught it,” said Lucy Stockton, the National Trust volunteer who sighted the arachnid along with companion Trevor Harris.

The duo’s discovery in Clumber Park marks just the fourth time the spider had ever been recorded in the UK, and the only time it's been seen in the north of the country. “We are absolutely delighted that this pretty, little spider has been re-found, we had almost given up hope,” commented Mark Shardlow, the chief executive of Buglife, an English conservation group. “It is a testament to the crucial importance of charities like the National Trust saving and managing heathland habitats.”

[h/t The Telegraph]

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Courtesy of Gem Diamonds Ltd.
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Fifth Largest Diamond in The World Discovered in Southern Africa
Courtesy of Gem Diamonds Ltd.
Courtesy of Gem Diamonds Ltd.

The Letšeng diamond mine in the southern African nation of Lesotho is known for producing large, high-quality gems. As Bloomberg reports, a massive diamond uncovered there recently is the mine's most impressive yet. The 910-carat stone is roughly the size of two golf balls and weighs more than a billiard ball.

The diamond is thought to be the fifth largest ever discovered on Earth. Gem Diamonds Ltd., the company behind the discovery, said in a statement [PDF] that the "exceptional top quality diamond is the largest to be mined to date and highlights the unsurpassed quality of the Letšeng mine."

Beyond its size, the diamond is also remarkable for its purity. The D color Type IIa status means there are little to no nitrogen atoms muddying its color. Though Gem Diamonds hasn't revealed their price, the diamond is likely worth a huge amount: up to $40 million, analyst Ben Davis tells Bloomberg.

That's a steep price, but it's nowhere near the highest ever paid for a diamond at auction. Rare colored diamonds tend to fetch the highest bids: In 2015, the Blue Moon diamond sold for $48.5 million, and in 2017 the Pink Star was auctioned off for $71.2 million, making it the most expensive diamond of all time.

[h/t Bloomberg]

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New Largest Known Prime Number Has More Than 23 Million Digits
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iStock

Prime numbers come in all sizes: They go down to single digits and grow infinitely larger. But calculating the exact quantity of the largest prime numbers in existence takes serious time and effort. Now, thanks to help from a volunteer and his computer, the Great Internet Mersenne Prime Search (GIMPS) has identified the newest largest prime number we know of.

The prime number has 23,249,425 digits, surpassing the previous record holder by 1 million digits. It can be written as 277,232,917-1 or M77232917. Like other prime numbers, the quantity can only be divided by one and itself. But unlike some smaller primes, this one joins a special category called Mersenne primes.

Mersenne primes are found by calculating numbers to the second power and subtracting the value of one from the total. Only 50 prime numbers have been found this way, and a lot of computing power is required to uncover them.

Since 1996, GIMPS has been crowdsourcing computers to discover larger and larger prime numbers. Anyone can download their program and dedicate their unused processing power to churning out algorithms in search of the next record breaker. Volunteers whose computers successfully identify a new prime number are eligible for a cash reward of up to $3000.

The most recent winner was Jonathon Pace, a 51-year-old electrical engineer from Tennessee. His computer calculated the number M77232917 on December 26, and its prime status was independently verified by four separate computers.

GIMPS is constantly outdoing itself, with the previous largest prime announced just two years ago. If you'd like to join the effort, their prime-hunting software is free to download. But don't expect instant results: Pace was volunteering with GIMPS for 14 years before his altruism paid off. 

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