The “Adaptiv” technology uses thermal cameras that pick up the ambient temperature around a tank, and a skin of hexagonal “pixels” that can quickly heat up or cool down to mimic their surroundings. The cloaking device can also imitate the heat signatures of a car, a cow, or a large rock.

In field trials, a cloaked tank looked like background scenery from distances of 300-400 meters. BAE says the Adaptiv pixel panels could theoretically be resized to hide other objects, like warships or buildings.

Clownfish, also known as anenomefish, are sequential hermaphrodites and live in very regimented schools made up of all males and one female.  The group is made up of a hierarchy with the female fish being the dominant and generally the largest fish in a given group.  The second in command of the group is usually the largest male, who is also generally the most aggressive male of the group.  This male will pair off with the female to breed.  The rest of the males in the area will not breed with the female.

Upon breeding, the female will lay sometimes thousands of eggs close to their home, usually on a rock or coral.  The two will then take turns guarding the eggs until they hatch around a week later.

If the female dies, the dominate male will then begin to gain weight and will become the female of the group.  It will then choose a breeding partner among the available males, which is usually the largest male available.  The two will pair off and breed together until something happens to one or the other, at which point the cycle begins again.

It is thought that this peculiar ability to change sex developed because, unlike many other types of fish, clownfish almost never stray very far away from their homes in sea anemones, which they form a symbiotic relationship with.  Because they stay in more or less one spot their whole lives, it would be very hard for them to find breeding partners if they weren’t able to change their gender.

Bonus Factoids:

• Other sea life that are known to change their gender include wrasses, which is a type of fish, and moray eels.  Unlike clownfish, wrasses switch from female to male with the largest female switching to male and taking over a group of females.
• As mentioned, clownfish form a symbiotic relationship with the sea anemone they live in.  The clownfish eat various small invertebrates and algae that could harm the anemone.  Their feces also serves to help fertilize the anemone.  The sea anemone offers a great deal of protection for the clownfish from predators.  The clownfish also gets food in the way of scraps from the anemone’s food. The clownfish return the favor by using their bright coloring to lure fish into the anemone, which are then killed by the anemone’s poison and eaten, with the scraps going to the clownfish.  Finally, it is thought that the clownfish’s frequent activity in and around the anemone provides better water circulation, which helps the health of the anemone.
• It isn’t exactly known how the clownfish survive the anemone’s very potent poison.  It is thought that the mucus coating their skin must be made up of some sort of sugar compound, rather than of proteins, which perhaps makes it so the anemone doesn’t recognize the clownfish as a potential food source and so doesn’t sting them.  Clownfish are also somewhat resistant to the toxins in the anemone, but not wholly.  When directly exposed to the toxins, when it penetrates their mucus layer, they will die like any other fish.
• Clownfish live in warmer water regions in the Indian and Pacific oceans.  They can particularly be found in the Great Barrier Reef and in the Red Sea.
• Because clownfish breed so easily in captivity and exhibit near constant, quirky activity while awake, they have become extremely popular aquarium fish.
• Occasionally, humans can also change sex naturally, at least in terms of changing external body parts.  In the vast majority of these cases where the change occurs naturally, a human born with female genitalia, will turn male after puberty.  This is usually due to a 5-alpha-reductase deficiency (5alpha-RD-2) or 17-beta-hydroxysteroid dehydrogenase deficiency (17beta-HSD-3).  Even more rarely, a person born with male parts will naturally turn female after puberty.  How this occurs from a genetic standpoint isn’t currently well understood.  It can also occasionally happen that a male or female human can be born with the opposite body parts and general physical appearance than their chromosome pairs indicate.  One famous example of this is South African professional runner Caster Semenya, who has female body parts, but is thought by some to be genetically a male.

Sources:

• Sequential Hermaphrodites
• Why Clownfish Change Gender
• Breeding Clownfish
• Clownfish
• Sex Change
• Clownfish
• 30 Strange Animal Mating Habits
• Caster Semenya
• Clownfish are all born males

Ships throughout history typically stocked a variety of different flags used for sending a message, signaling other ships, and for identifying themselves.  For instance, in the 17th and 18th centuries, English privateers were to fly a specific version of the Union Jack, distinguishing themselves from English naval vessels which flew a different version of the Union Jack.  Pirate ships were no different, excepting perhaps that they often carried flags for more nefarious reasons like fooling nearby ships into think they were allies until they got close enough that the other ship couldn’t escape.

The most famous flags flown by pirates to indicate they were such were all called the “Jolly Roger” and were adorned with a variety of artwork or often no art work at all.  Most of these flags were simply black or red with nothing on them.  Historical accounts indicate that, should a pirate ship raise a black flag, it indicated that so long as the ship they were attacking surrendered with no resistance, they would be given quarter.  Should anyone aboard the ship resist or should the ship try to flee once the black flag was raised, the black flag would be lowered and the red flag would be raised.  This flag indicated that no mercy would be shown to anyone aboard the ship that was about to be attacked.

Pirate ships were much more feared than other types of enemy vessels because, in resisting other enemy vessels, at any point you could surrender and be offered quarter by the traditional rules of engagement; so you could fight until losing was inevitable, then surrender.  With pirate ships though, flying the black flag, you had to surrender immediately if you didn’t think you could win.  As pirate ships rarely attacked unless they were in a good position to win, this pretty much meant that, if you encountered a pirate ship, you should probably just surrender right away.

As such, flying of any form of the Jolly Roger tended to instill the necessary fear in whatever ship was being attacked that they would surrender immediately.  In one extreme example, in 1720, famed pirate Bartholomew Roberts sailed into a harbor at Trepassey, Newfoundland with a black flag flying.  This resulted in the crews of all 22 vessels in port panicking and abandoning their ships.  Combined, Roberts would have been no match for them, but the necessary fear was invoked from seeing the black flag that they all fled without a fight.

Records of pirate ships flying flags that signified they were pirates go back just about as far as history is recorded.  Of the Jolly Roger line though, the earliest reference is probably of the skull and crossbones flag used by the Knights Templar, who had the world’s biggest naval fleet in the 13 century and were well known for their pirate-like acts on the sea.   When the Knights Templar dissolved, with many members forming the Knights of Malta who were equally known for their piracy, they also were known to fly the skull and crossbones.

The origin of the skull and crossbone flag within the Templar tradition stems from variations of this legend: “A great lady of Maraclea was loved by a Templar, A Lord of Sidon; but she died in her youth, and on the night of her burial, this wicked lover crept to the grave, dug up her body and violated it. Then a voice from the void bade him return in nine months time for he would find a son. He obeyed the injunction and at the appointed time he opened the grave again and found a head on the leg bones of the skeleton (skull and crossbones). The same voice bade him guard it Well, for it would be the giver of all good things, and so he carried it away with him. It became his protecting genius, and he was able to defeat his enemies by merely showing them the magic head. In due course, it passed to the possession of the order.”

What’s interesting about this is that the port of Sidon was known historically to be a nest of pirates.  Thus, the skull and crossbones, as a pirate flag, probably predates the Knights Templar.

In any event, as noted earlier, the skull and crossbones weren’t the only flag to be known as the “Jolly Roger”.  Traditionally, any black flag flown, even with no design on it, simply meant the ship flying it was a pirate ship and was offering quarter if the ship about to be attacked would surrender immediately.  Any red flag, whether there was a design on it or not, meant the pirate ship would attack and offer no mercy.

The earliest references to the name “Jolly Roger” goes back at least to the early 18th century, with one of the earliest documented instances appearing in Charles Johnson’s A General History of the Pyrates (1724).  In it, he references that two pirates from the early 18th century, Bartholomew Roberts and Francis Spriggs, had named their individual flags “Jolly Roger”.  These flags were quite different in appearance, so historians think that this generic name for pirate flags of all varieties was already well established.

The origin of the “Jolly Roger” name itself is thought to stem from one of the following three things.  First, that it is simply adapted from the English word “roger”, which basically just means “wandering vagabond”; indeed, another name for the Devil among the English at this time was “Old Roger” and putting a depiction of the Devil on these flags was quite common.

Another possibility comes from the 17th century French “jolie rouge”, which meant “pretty red” and, thus, was what the red flags were called.  Accounts as early as the 18th century also have the black versions of these flags being called the “Jolly Roger”.  So if “Jolly Roger” stems from this, sometime between the 17th and 18th centuries the meaning was expanded to mean all pirate flags, regardless of color.

An alternative theory comes from the fact that certain Asian pirates called their captains by the title “Ali Raja”, meaning “King of the Sea”.  It’s possible that this term was then adapted by the English for eventual usage as the name of their pirate flags.

Personally, I think the first theory stands up to Occam’s razor the best, being the simplest solution that also, indecently, makes a lot of sense.

Bonus Factoids:

• The idea of “walking the plank” isn’t based on known historical events.  Rather, accounts of this sort of voted killing of shipmates by drowning tended to just result in the person being tossed over the side.
• While walking the plank isn’t historically based, pirates marooning people is.  In these cases, the victim would simply be left on a small deserted island to presumably eventually die of dehydration or exposure or possibly even starvation if they had nothing to catch sea-life with.
• The Skull and Crossbones in Unicode is U+2620.
• The Jolly Roger wasn’t just used by pirates, the skull and crossbones version is also used by various military forces, even commonly today on submarines in certain navies of the world.
• The tradition to use the Jolly Rodger on submarines stems from 1901 when Admiral Sir Arthur Wilson VC said submarines were “underhand, unfair, and damned un-English. … treat all submarines as pirates in wartime … and hang all crews.”  Upon learning of this, Lieutenant Commander Max Horton, who later became an Admiral, raised the Jolly Rodger when his submarine was returning to port after sinking the German ships SMS Hela and the destroyer SMS S-116.  Thus, the tradition was born that on the completion of a successful mission, the returning submarine should fly the Jolly Roger.  This eventually spread into the Jolly Roger being the official emblem of the Royal Navy Submarine Service.
• Spanish tombs and graveyard entrances at one time were traditionally marked with real skulls and crossbones and today are often marked with carved skull and crossbone signs.
• A notorious “secret” society at Yale goes by the name of Skull and Bones.  The alumni organization that owns the property and oversees the organization is official called the Russell Trust Association, named after General William Huntington Russell who was one of the cofounders of the association, along with Alphonso Taft in 1832.  Former members of this association include President George H. W. Bush, Goerge W. Bush, John Kerry, President William Howard Taft, Supreme Court Justice Potter Stewart, Secretary of Defense Robert A. Lovett, Senator David L. Boren, Obama’s economic advisor Austan Goolsbee, and many other highly placed and successful individuals.   Many conspiracy theorists view the society as somehow evil and attempting to establish some new world order where its members rule everything; they often cite the fact that so many known Bones alumni go on to be incredibly successful to show the conspiracy.  However, if they were really trying to establish some new world order, you’d think they’d open other chapters at other Universities around the world as 5-15 new members a year isn’t going to cut it for taking over the world.  Also, it should be expected that the Bones alumni would go on to be incredibly successful due to the fact that the society typically only selects a handful of members per year from elite students at Yale.  In light of that, it would be shocking if known members didn’t go on to high levels of success in their chosen fields.
• Pirates typically wore things like scarves, bandannas, hats, etc. to ward off the sun.  It is also theorized, though not known for sure, that they wore eye patches to keep one eye adjusted to light levels inside, while the other was adjusted to the extreme brightness often experienced outside at sea.  This way, if they had to run below deck, they could remove the eye patch and be able to see out of that eye instantly.  Whereas without the patch, they’d need to wait a while before they’d be able to see well.  Pirates and other sea-fairing folk also tended to wear tight clothing so that it wouldn’t catch on ropes or get jammed in pulleys and things of this nature.
• The stereotype that pirates often had peg legs or hooks instead of hands comes from the fact that the typical method of repairing a badly damaged appendage used to be to simply saw it off as quick as possible (often literally with a hand saw and no pain killer), before it became infected, and then cauterize the wound.  Given the pirates lifestyle, these such injuries weren’t terribly uncommon.  However, as you might expect, having a peg leg, on a ship that is being tossed about by the ocean, isn’t a recipe for keeping your balance, so it is unlikely there were many peg-legged pirates.  Further, winching lines and the like wouldn’t be very easy with one hand that was a hook.  So once these sorts of injuries happened, unless the injured was a cook or the captain or the like, it’s unlikely they were allowed to continue serving.
• The classic “arrrrr” noise that accompanies pirate-speak in the movies probably has its origins in the 1950s version of Treasure Island.  Actor Robert Newton played the particularly memorable pirate character Silver; he later popularly reprised the role in sequels and on TV.  His accent on the films featured a very strong rolling of the R’s, which is thought to be how “arrrrr” worked its way into pirate-speak.  Most of the rest of pirate-speak, like “avast”, are simply just old nautical terms used by all seaman, not just pirates.

Sources:

• Why are pirates depicted with a parrot on their shoulder?
• Skull and Crossbones: The Untold Tale of the Templar Shining Ones
• Skull and Crossbones (military)
• Skull and Crossbones (Cemetery)
• Skull and Bones
• Jolly Roger
• Why was the pirate flag called the Jolly Roger?
• Origins of the Jolly Roger

Happy Now Sad Later of the Day: Denny’s outdoes its own fried death sandwich with the 1690-calorie Mac ‘n Cheese Big Daddy Patty Melt: A hamburger patty topped with creamy mac ‘n cheese and “zesty Frisco sauce” stuffed inside a grilled cheese sandwich on potato bread. An extra shot of “ooze” (whatever that is ) costs 69 cents.

The arteriosclerosis, however, is free of charge.

[eater.]

OMG! Adorbz of the Day: Needs more Detective John Kimble.

Also: It’s not a tumah!

[urlesque.]

Louis Stevens directed a music video for Marilyn Manson that features, among other things, Manson in surgical scrubs inserting an eyeball into a vagina.

Your childhood is officially over.

(NSFW.)

[snb.]

Professional wingsuit flyer Jeb Corliss launches himself like a flying squirrel off a cliff in Switzerland into glory.

[dpaf.]