Part 13 (1/2)

1980s, TENNESSEE

A mile down the road from Middle Tennessee State University, a couple of young, very drunk MTSU frat boys climbed a barbed-wire fence that was intended to keep lesser mortals out of an electrical substation. One frat boy climbed right up to the top of a transformer tower. That alone was an obviously bad idea, but it got worse when he urinated on the transformer on which he stood. As if electrocution via genitalia wasn't bad enough, consider his motivating target: a wasp nest attached to the transformer. Needless to say, with electricity and gravity competing for attention, the wasps were the lesser of his worries. He did not live long.

Reference: Anonymous resident of the community WE CHALLENGE MYTHBUSTERS MYTHBUSTERS!Readers skeptical of this story have cited the MythBusters MythBusters episode debunking the so-called myth of peeing on the third rail. However, the large number of incident reports we have received over the years, as well as conversations with reporters and medics, incline us to believe that episode debunking the so-called myth of peeing on the third rail. However, the large number of incident reports we have received over the years, as well as conversations with reporters and medics, incline us to believe that people do harm themselves people do harm themselves by urinating on electrified things. by urinating on electrified things.”Coffee Can of Water” from Jim:[image]”One fact I know: If you scoop up a coffee can of water from a stream next to an electric fence, then pour that water on the fence, you will feel a decent shock through the can. As kids, we dared each other. Now, the next logical dare was, who had the guts to pee on that fence? n.o.body ever did, but I am very confident that urine would be as conductive as the water from that stream.””Herschel the Doberman” from Donna:”We had been dog-sitting Herschel, an unruly Doberman. When Chris came to pick up Herschel, he hooked the metal chain collarto the metal chain leash and headed outside. Herschel realized it was going to be a longride home and c.o.c.ked his leg to take a whiz-right on our electric fence! The electric charge ran up the urine stream, through the metal collar, across the metal leash, and into Chris. Herschel yelped, Chris swore, and both jumped back, breaking the contact. Without question, you can definitely get a charge out of peeing on an electric fence!””Sentry Duty” from Jamie:”Duringofficer training, the pain of digging full-depth trenches in flinty soil was offset by the fun of sentry duty. During the night, the thick fog was regularly punctuated by small blue flashes as returning patrols blundered into the electric fence a farmer had laid along our main fence. Even betterwas watching people nip out for a pee against a fence post. At some point the spray would hit the live wire, with the same flash and yelp every time!”[image]

At-Risk Survivor: Shocking Rappel Confirmed by Darwin Featuring electricity and gravity

1 JUNE 2008, WEST VIRGINIA

In search of alt.i.tude, a man climbed the high-voltage power-line tower behind his house, attached a rope to the top of it, and began to rappel down. But he was shocked to discover that his ”harmless” hobby was not safe at all when he hit a power line that carries as much as 46,000 volts, according to American Electric Power employees. The man fell to the ground, a battered but lucky survivor of what easily could have been a Darwin-Award-caliber misjudgment.

Reference: The Charleston Gazette The Charleston Gazette [image]

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At-Risk Survivor: Shockingly Conductive Unconfirmed Personal Account Featuring electricity and a tree!

1971, FLORIDA

An aviation electronics instructor began his cla.s.s on insulators with this observation: ”Wood is a nonconductor, right? Well don't you believe it!”

He had purchased an acre of property that was covered in fast-growing poplar trees, each about five inches thick and twenty feet tall. Ax in hand, he set out to clear the yard. His wife expressed concern about the high-voltage power lines that pa.s.sed along the edge of the lot, but he a.s.sured her that there was nothing to worry about. Wood is nonconductive.

A few minutes later one of his mighty blows felled a tree, which toppled directly onto the power lines. He stood there transfixed as the blue electricity snaked down the tree trunk and up the ax handle, and blew him twenty feet across the yard. Fortunately his wife witnessed the event and rushed his twitching carca.s.s to the hospital, where he was treated for third-degree burns on the palms and soles of his feet (where the electricity entered and exited his body). He was kept in the hospital for two weeks, until his arms quit shaking uncontrollably.

He a.s.sured his wife there was nothing to worry about.

Wood is nonconductive? Don't you believe it! Don't you believe it!

Reference: Carin Gleason [image]

At-Risk Survivor: Christmas Light Zinger Unconfirmed Personal Account Featuring a woman, holiday, and electricity

2009

I was helping a friend decorate her tree for Christmas. A strand of lights seemed to have a short, so my friend took it upon herself to solve the problem. She stripped the wires in the area and spliced them, and plugged in the lights to check her work. Then she finished up by using her teeth to crimp the bare wires together. Needless to say, she lit up like a Christmas tree!

Reference: Robert Miller

SCIENCE INTERLUDE QUORUM SENSING: SECRET LANGUAGE OF BACTERIA.

By Adam Mann

The enemy is all around us, invisible, deadly, and using a secret code to coordinate its attacks. In the world of biological warfare, bacteria have humans outnumbered. Not only are there countless combatants on the ground and in the air, but also many species live on and inside our bodies. You are composed of around one trillion human cells, yet at least ten trillion bacteria also call you home. You are more bacteria than human by an order of magnitude!

Although we rarely stop to consider their existence, bacteria are leading intriguing and noisy lives. In recent years, microbiologists have discovered that bacteria possess a useful skill previously thought to be employed only by higher organisms: language.

Scientists call this bacterial language ”quorum sensing.” Unlike our own speech, it relies solely on simple molecules. With these chemicals, bacteria are able to reach group decisions and coordinate many behaviors, including ma.s.s migrations and deadly attacks. Once considered an exotic anomaly, quorum sensing recently has been discovered in nearly all bacteria. Every species has its own vocabulary to prevent eavesdropping by neighboring bacteria, though their languages are as closely related as Spanish is to Italian.

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Quorum sensing works like this: An individual bacterium constantly releases a particular chemical into its environment, telling its brethren, ”I'm here!” Other bacteria of the same species hear this message while releasing their own ”I'm here!” chemical. The bacteria sense the concentration of that chemical and are thus able to estimate how many of their siblings are in the immediate surroundings. Armed with this information, they make decisions based on their quant.i.ty.

For humans, bacterial quorum sensing can be deadly.

For example, a lone member of a life-threatening species might get into your body. By itself, it stands no chance of evading your immune system and taking you down. Producing toxins, or doing anything except laying low in such an environment, would be a waste of energy.

But there is strength in numbers. Over time, the bacterium multiplies, and perhaps a few more sneak into your body, each loudly announcing its presence while multiplying furiously. Soon enough, there is a whole bacterial chorus shouting to the world of their arrival. Once the bacteria have ma.s.sed enough troops to take you down, they begin their attack and pump out toxins. You get sick. Without treatment, you may die.

While the scenario seems dire, understanding quorum sensing is giving researchers hope. Biologists are learning how to decode this bacterial language and produce chemical tools that ”jam” some of the communication lines. This method is a brand-new tactic in the fight against antibiotic resistance. This method is a brand-new tactic in the fight against antibiotic resistance. Quorum sensing evolved billions of years ago, so it is likely to be much harder for bacteria to develop immunity to these weapons, compared to the relative ease of defeating traditional antibiotics. Quorum sensing evolved billions of years ago, so it is likely to be much harder for bacteria to develop immunity to these weapons, compared to the relative ease of defeating traditional antibiotics.

Scientists are now manufacturing molecules that silence the bacterial dialogue, turning the bacteria's advantage into a disadvantage.

Antibiotic-resistant bacteria are a serious problem worldwide. Our reliance on penicillin, ampicillin, and other antibiotics-while lifesaving-has produced some nasty strains of killers. For instance, one of the most well-studied quorum-sensing bacteria is the opportunistic Pseudomonas aeruginosa Pseudomonas aeruginosa. Some strains are highly resistant to antibiotics, and this microbe is often responsible for nosocomial infections-pneumonia and wound infections acquired during a patient's stay in a hospital.

P. aeruginosa colonies are clever. They signal to one another when a host's white blood cells are on the march and, as a group, produce a chemical that eliminates the white blood cells, disabling a patient's immune system. And once these shrewd bugs know that they've reached high density in a body they can enter into a state known as a biofilm, a gooey layer of germs and proteins that acts as a s.h.i.+eld against antibiotics. colonies are clever. They signal to one another when a host's white blood cells are on the march and, as a group, produce a chemical that eliminates the white blood cells, disabling a patient's immune system. And once these shrewd bugs know that they've reached high density in a body they can enter into a state known as a biofilm, a gooey layer of germs and proteins that acts as a s.h.i.+eld against antibiotics.

But, by knowing which chemicals are used to coordinate this conspiracy, doctors may someday gain the upper hand and turn the P. aeruginosa P. aeruginosa deaf to their comrades. Without speech, individual bacteria will no longer be able to go about their trickery. This could be a huge boon to hospital patients, particularly immune-compromised ones such as those with AIDS or undergoing radiation therapy. deaf to their comrades. Without speech, individual bacteria will no longer be able to go about their trickery. This could be a huge boon to hospital patients, particularly immune-compromised ones such as those with AIDS or undergoing radiation therapy.

Aside from medical applications, there are many interesting complexities to quorum sensing.

A microbe never lives alone: A diverse jungle of species usually surrounds it. While each has its own language, there is a second system-a bacterial lingua franca lingua franca-that allows all species to communicate with one another. Referred to as quorum-sensing cross talk, this scheme allows bacteria to measure the total amount of other species in their neighborhood. Researchers are just beginning to understand this cross talk, which could allow species to make decisions together based on the local environment.

Furthermore, using genetic a.n.a.lysis, researchers discovered that bacteria have been ”speaking” for far longer than we have. Quorum sensing is so widespread in bacteria that it must have evolved billions of years ago and provided such a survival advantage that it stuck around. By studying the genetic changes that control quorum sensing, scientists will be able to trace lineages and better understand bacterial evolution.

In fact, since quorum sensing has been around for so long, it means that we multicellular creatures came into being against a chattering background. Some scientists believe that learning about bacterial communication will give insight into how our own cells organize into tissues and organs, a process that obviously involves close coordination.