Nobody Pinches Harder Than a Coconut Crab

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Shin-ichiro Oka

Behold the coconut crab and its magnificent clampers. Scientists in Japan say the strength of the crab’s “mighty claw” is greater than most predators’ jaws. They published a report of their crab tests in the journal PLOS One.

Coconut crabs (Birgus latro) are strange, strange critters. They’re crustaceans, but they live on land. They climb trees, as if that’s a thing that crabs should be doing. They’re huge—adults can easily reach 3 feet across. They can lift more than 60 pounds at a time. They’ll feed on dead and decaying animals when they have to, but they prefer tropical fruit, especially the coconuts that gave them their name.

But as anyone who’s ever been stranded on a desert island knows, coconuts are not a convenience food. Getting inside requires desperation, persistence, and a very tenacious claw.

Researchers at the Okinawa Churashima Foundation wondered just how strong that claw could be. They didn’t have to go very far to find out; the island of Okinawa is a veritable coconut crab paradise.

Oka et al 2016. PLOS One

 
The scientists rounded up 29 wild crabs, weighed them, and took measurements of their bodies, legs, and claws. Then they dangled stick-like metal sensors in front of the crabs, who predictably grabbed the instruments and clamped down as hard as they could. Once the test was over, the crabs were released … which must have been something to see.

The results of the pinch tests were impressive. The larger a crab was, the harder it could pinch. Using this formula, the researchers determined that a large crab could exert up to 3300 Newtons (N) of force with a single claw.

That’s a lot of Newtons. To put it in context: scientists estimate that human jaws have a bite strength of about 754 N. Wolves have 1267, black bears 1747 [PDF]. Pound for pound, a coconut crab’s claws come down almost twice as hard as a black bear’s jaws. The authors estimate that there’s only one land predator that can outclamp the coconut crab, and that’s an alligator.

The crab’s “mighty claw” is what’s allowed it to survive, the authors write. Not only is it a weapon, but it’s also a tool, allowing the crab to get inside just about any organism, plant or animal, it wants.

So, kids, for your fingers’ sake: Please don’t tease the coconut crabs. Leave that to the professionals.


November 23, 2016 – 2:01pm

7 Rarely Used Orchestral Instruments

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Composers have long pushed the boundaries of classical music by writing parts for new and innovative instruments—but not all of them have ended up a permanent fixture in the orchestra …

1. SARRUSOPHONE

The sarrusophone (above) was invented in 1856 and named in honor of the French military bandleader Pierre-Auguste Sarrus. It was originally developed as a replacement for relatively quieter woodwind instruments in military bands: its rich, deep, saxophone-like tone was stronger and better suited to outdoor performances than that of smaller woodwind instruments, like the oboe.

Although never a particularly widely used instrument, the sarrusophone enjoyed a burst of popularity in the early 1900s when a number of big-name composers—including Maurice Ravel, Frederick Delius and Igor Stravinsky—wrote parts for it in a number of their compositions. But probably the most famous work to include a sarrusophone part is The Sorcerer’s Apprentice by the French composer Paul Dukas, which was famously put to use in the 1940 Disney movie, Fantasia. Nowadays, however, the unfamiliarity and unpopularity of sarrusophones means that these parts are more often than not taken by the contrabasson.

2. GLASS ARMONICA

Invented by Benjamin Franklin, the glass armonica (or “harmonica”) comprises a revolving set of glass cups or rings which produce a shimmering sound when played with dampened fingers. Despite its relative obscurity, plenty of classical composers—among them several major names, including Mozart and Beethoven—have written works for the glass harmonica, although it seldom appears in larger ensemble or orchestral settings. One well known exception is Camille Saint-Saëns’ Carnival of the Animals: in the Carnival’s famous Aquarium movement, an echo of the flute melody is played one beat later on the glass harmonica.

3. HECKELPHONE


The heckelphone is essentially a cross between a bassoon and an oboe that was invented by the German instrument maker Wilhelm Heckel—apparently at the request of Richard Wagner—in the late 19th century, although it didn’t make its first appearance in classical music repertoire until the early 1900s.

In compositions of the time, the heckelphone was often listed under the title of “bass oboe,” but that designation was also given to the similar hautbois baryton, another deep-pitched woodwind instrument, making it all but impossible to tell which instrument the composers in question wanted: Gustav Holst’s famous Planets suite, for instance, includes a part for a bass oboe, but it’s unclear whether he had the heckelphone in mind or not. One composer who made his intentions clear, however, was Richard Strauss, who singled out the heckelphone in the score for his enormous Alpine Symphony in 1915.

4. THEREMIN

Invented by Leon Theremin in the early 1920s, this bizarre electronic instrument is probably best known to modern audiences for providing the spooky, high-pitched droning sound used in classic sci-fi movie soundtracks like Bernard Herrmann’s The Day The Earth Stood Still (1951). But several more composers of the early-to-mid 20th century wrote parts for the theremin in their orchestral works, including composer and musical theorist Joseph Schillinger: his First Airphonic Suite (1929) made superb use of the theremin’s curious sound alongside a full symphony orchestra. Here is a video of a theremin being played by a cat.

5. WAGNER TUBA

It’s not strictly speaking a tuba, but it was at least invented at the request of Richard Wagner: Wagner tubas or Wagnertuben first became popular in the mid-19th century and were first used by Wagner in his score for Das Rheingold (1854) as a richly-toned instrument intended to fill the tonal space between the tuba, the trombone and the French horn. Since then, Wagner tubas have been used (albeit relatively infrequently) by a number of famous composers, including Igor Stravinsky, Richard Strauss, and Béla Bartók.

6. PREPARED PIANO

Classical composers have been writing piano concertos since the late Romantic period; Mozart wrote his first piano concerto in the mid-1760s when he was just 11 years old (largely based on others’ works). Since then, the piano concerto has become one of the most popular of all orchestral arrangements, with Beethoven’s Emperor (1811) and Edward Grieg’s Concerto in A minor (1868) being among the most famous and most frequently performed.

Maverick American composer John Cage, of course, had to go one better by writing a concerto for prepared piano—namely, a piano with everything from drawing pins and rubber bands to corks, forks and cotton balls inserted among the strings and hammers to give the instrument a bizarre range of percussive sounds and tones. Written for piano and chamber orchestra, the concerto premiered in New York in 1952.

7. CANNON

Admittedly, a cannon can hardly be classed as a musical instrument—but that didn’t stop Tchaikovsky from writing “a battery of cannons” into the score of his monumental 1812 Overture in 1882. Although actual cannon fire is sometimes used in larger (and, for obvious reasons, outdoor) performances of the 1812, typically most modern performances replace the cannons with audio recordings or theatrical sound effects, or else hand the 16 cannon blasts the score requires over to a similarly loud percussion instrument, like a bass drum or timpani. No matter how it’s handled, however, the effect is a rousing conclusion to a piece of music Tchaikovsky himself dismissed as “very loud and noisy.”


November 23, 2016 – 2:00pm

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Beware of Buying ‘Aloe Vera’ That Contains No Aloe Vera

filed under: health, plants
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Aloe vera can be the harbinger of relief for sunburn, but the latest news about the gel you buy at the drug store should make you burn even more. In lab tests, several generic store-brand aloe vera gels don’t appear to contain any aloe at all, Bloomberg reports.

Even though store-brand aloe vera from Wal-Mart, Target, and CVS lists the leaf juice of the aloe barbadensis plant—as the No. 1 or No. 2 ingredient, no less—lab tests commissioned by Bloomberg News showed no traces of such an ingredient. The nuclear magnetic resonance tests showed the presence of additives used to imitate aloe, like maltodextrin, but did not detect any of the three chemical markers contained in true aloe, such as acemannan, malic acid, and glucose.

Naturally, the companies that make the aloe vera sold by Wal-Mart, Target, and Walgreens as their store brands denied the accuracy of the findings. However, several law firms have already filed class-action lawsuits against companies like CVS and Fruit of the Earth, the makers of the “100 percent Aloe Vera Gel” sold by major retailers.

When shopping for aloe vera gel, don’t go for the cheap stuff, since that low price may reflect that the company hasn’t spent the money on aloe vera powder, substituting cheap ingredients like maltodextrin. Better yet, buy the plant itself, giving you the peace of mind of always knowing it’s truly aloe.

[h/t Bloomberg]


November 23, 2016 – 1:30pm