Investigación pornográfica

Sexualmente explícito.. Cuidado con los niños!!
 dererumnatura-carolushenricus.blogspot.com/ human-sex-from-inside-out

Inventores chucruteros

en.wikipedia.org/wiki/German_inventors_and_discoverers

"Made in Germany"
German Inventions - Discoveries
A Sampling of German Inventors and Inventions

Diatomeas

Electron microscope images of diatoms by Dr Paul Hargreaves and Faye Darling

This may look like Salvador Dali's Mae West Lips Sofa, but it is a colourised scanning electron microscope image of a diatom - a tiny single-celled marine creature invisible to the naked eye. Diatoms are a type of algae or phytoplankton that typically measure just 0.002 inches across, and are thought to pre-date the dinosaurs. Oceanographer Dr Paul Hargreaves uses an electron microscope to photograph the creatures, and artist Faye Darling uses digital paint programmes to colourise them.

History of Female Contraception

Source

By Victoria Nottingham
In the past, a woman used birth control primarily to avoid pregnancy, especially if she already had many children. Before the advent of modern medicine, pregnancy was a dangerous business and many women died during or after childbirth. Much of the birth control methods that were developed were done so by trial and error, and the secrets that were discovered were quietly passed on from woman to woman.
Dances, Amulets, Rituals, and Myths
The earliest documented forms of birth control were dances, rituals, amulets, and myths. By the 2nd-century CE, Greek gynecologist Soranus knew that women were fertile during ovulation and promoted the rhythm method. (Unfortunately, he was incorrect in his assumption that ovulation occurred during menstruation, rather than prior to it.) He also recommended several, less scientific, ways to prevent conception: holding the breath and drawing the body back during sex so the sperm could not penetrate the mouth of the uterus; dislodging the sperm by jumping backwards seven times after intercourse; and sitting down on bent knees in order to provoke sneezing! Similarly, prostitutes in 1st-century BCE are said to have ground their pelvises in a manner that increased their partner's pleasure, with the assumption that the movement simultaneously diverted the sperm away from the womb.
Ancient Roman women wore a leather pouch containing a cat's liver on their left foot during sex to prevent conception. Another preventative was spitting in the mouth of a frog three times. European women were advised to turn the wheel of a grain mill backwards four times at midnight. Others thought that if they inserted a finger into the vagina and "swished it around" after intercourse, it would dislodge or confuse the sperm. Around the same time period, women in other parts of the world wore birth control necklaces or carried amulets to prevent pregnancy.
And in cultures where the moon was believed to be responsible for fertilizing crops, women slept out of the moonlight, so as not to be impregnated by moonbeams. In a similar vein, Papuan Islanders worried that homosexual males might become pregnant. To ensure that this did not occur, they held ceremonies during which they fed them limes to avoid conception.
A more reliable method used in ancient times was continuous breastfeeding, which can prevent ovulation, often until a child was three years old. And a guaranteed method of birth control? Abstinence. In the Middle Ages, some women in Catholic Europe opted for a life in the church. The decision was encouraged, in part, because the vocation meant that money would be given and/or left to the church, initially in the form of a dowry and later, if there was any, as an inheritance.
Spermicides, IUDs, Pessaries, and Douches
In the ancient medical manuscript the Ebers Papyrus (1550 BCE), women were advised to grind dates, acacia tree bark, and honey together into a paste and apply it with seed wool to the vulva. Modern science has shown that, since acacia ferments into lactic acid, a well-known spermicide, this method may have been effective. Other compounds that were smeared around the vagina included olive oil, pomegranate pulp, ginger, and tobacco juice.
Historians believe the Arabs invented intrauterine devices: they placed pebbles in the uteruses of their camels, so they would remain "unhindered" for long trips through the desert. In 1920, German gynecologist Grafenberg developed the first proper IUD for humans, using silkworm gut and silver wire coiled into a ring.
Pessaries (vaginal suppositories or diaphragms) have been recorded as early as 2nd-century BCE. Substances used include elephant or crocodile dung, leaves, and seaweed. Another so-called pessary, which was developed by a man, was a wooden block, similar in size and shape to a doorstop. This method was condemned in the 1930s as an instrument of torture. Other methods have included placing an apricot pit in the uterus, or a product consisting of cocoa butter, boric acid, and tannic acid.
Throughout history, women have also used objects such as sea sponges or soft wool as a sperm barrier, often in combination with lemon juice or vinegar as a spermicide. Half a lemon might be inserted into the vagina. Oriental women used oiled paper to "cap" the cervix, while European women used beeswax.
Soluble pessaries came into the market in the 1800s – these were quinine or cocoa butter tablets that were inserted into the vagina before intercourse. The first brand, Wife's Friend, was created by W.J. Rendell.
Douches have been used throughout history. Since at least the 1600s, French prostitutes used syringes to douche with an acidic liquid, which was thought to be more effective than water.Oral Contraceptives
Oral contraceptives have been available for more than 4,000 years. Women in ancient China drank mercury to prevent pregnancy. Later, women in India imbibed carrot seeds, and an aboriginal group in Eastern Canada drank a tea brewed with beaver testicles.
In Ancient Greece and Rome, the juice of the silphium plant was a popular and effective form of oral contraceptive, which women took once a month. Unfortunately, the siphium plant only grew in one place in Cyrene was extinct by the 1st century CE. In the 2nd century CE, Soranus advised women to drink the water that blacksmiths used to cool hot metals. Urine and animal parts and poisons such as mercury, arsenic, and strychnine were also used as oral contraceptives.
Abortion
Despite continuous debate over the ethics of abortion, it has been practiced throughout the centuries.
Throughout history, midwives doubled as informal family planning counselors, who would help with childbirth as well as with unwanted births. Emmenagogues (which bring on a period) and abortifacients were known as "women's medicines," which were used like the modern morning after pill. In the early 1900s these products were advertised as "removing obstructions" and "preventing irregularities" in the menstrual cycle.
Much of the information that these "wise women" knew has been lost over time – the information was taboo by most religious standards, and history and medical books were written by men, who were not as interested in "women's problems." But because of this lost information about herbal contraceptives, modern accidents have happened. For instance, pregnant women drinking pennyroyal tea may unwittingly miscarry. In one of Aristophanes' Ancient Greek comedies, Hermes advises the hero to "add a dose of pennyroyal" to keep his mistress out of trouble. Other herbs that have been taken to prevent or abort pregnancy include willow leaves, colocynth, and yarrow.
Despite the great technological and medical advancements of the 21st century, looking back at the history of birth control, we still have to ask: How far have we come, really?
Also read History of Male Contraception and It's a Mad, Mad World .

Tetas chicas? Soluciones!

8 Terrifying Instruments Old-Time Doctors Used on Your Junk
La buena medicina de antaño!
Porqué no chuparlos personalmente?

Foot Operated Breast Enlarger Pump

Photo courtesy of The Museum of Quackery.

Insecure about your lack of enormous boobs, ladies? Husbands, want to modify your wife to suit your needs without expensive surgery? Well back in the day you could always put down some hard-earned money for this set of rubber tubes topped with pink, boob-ish looking suction cups, aka the Foot Operated Breast Enlarger Pump.

All the ladies had to do was slap the cups to their milk silos and repeatedly pump a foot pedal like a person just about to wrap their car around a tree. The suction would elongate the breasts thereby giving the illusion of growth when, in reality, the only physiological response was horrifying bruising that made it look like they had been in a brutal tit fight.

Brutal Tit Fight is also a good band name.

Yeah, those turn of the century folk sure were idiots, thinking they could dupe people in to buying their grossly illogical machines that promised wonder cures for all the genitals they were applied to.

Oh, wait. These were sold in 1976. They sold more than four million of them.

And check out Dr. Swaim's intriguing essays on health issues facing the human race, in Brown Fat: How Evolution Is Saving Us From Our Own Fat Asses and The 5 Most Likely Ways Humans Will Become Obsolete.

6 Sex Myths as Explained by Science

Source

#4. Sex Makes Men Sleepy

The Conventional Wisdom Ladies, you've just had a passionate roll in the hay with your significant other (or drunken mistake). Since you're a girl, all you want to do after sex is cuddle and talk about marriage and missing your period. But when you roll over, he's already snoring into his pillow!
Anyone who's ever seen a female stand-up comedian has heard this story. He just wants to shoot his wad and doze off, probably immediately after leaving the toilet seat up! Am I right ladies? It fits in nicely with the stereotype that men don't care about romance, and that women are emotionally needy. But it's just a cliche, right?

Science Shows... Actually no. There's a scientific reason men fall asleep after sex. It's not their fault.
According to experts, an orgasm literally changes a man's body chemistry. Combine that with the physical exertion of sex and chances are that most dudes will go down like they were hit with a tranquilizer dart.

Deal with it.

So please, ladies, stop treating it like a personality flaw. And don't let him have sex with you if he's also flying a helicopter at the time.

#1. Jocks Get All the Girls

The Conventional Wisdom If we can learn anything from countless classic 80s movies and television shows, it's that rich kids and jocks get all the girls. Oh sure, every once in awhile a nerd from Lambda Lambda Lambda can steal the starting quarterback's woman, but more often than not you're going to end up being the Duckie to some pretty boy's Andrew McCarthy.

Science Shows... Well we've got good news, Poindexter. Despite lacking the social skills and rugged good looks of your athletic counterparts, it turns out that chicks really do dig brains over brawn.

Good news, Cracked writers!

At least, that's what this study has concluded. As it turns out, it doesn't matter if a woman wants a long term relationship or just a little fling. The common denominator (that one's for you, dorks!) in what a woman really wants is a dude with a high IQ. No, seriously.

Using a series of tasks that apparently combined Survivor with Mr. Wizard, researchers filmed 15 different men ranging in intellect and athleticism and then showed those videos to 200 college-aged women. The men would then be judged based on perceived intelligence, creativity and the ability to do physical tasks like catching a Frisbee and kickboxing.

Sex machine.

What the studies showed was that, more often than not, the creativity and overall braininess of these potential Dating Game-style suitors won out over simply being good looking. Now don't get us wrong, the study also showed that women still preferred guys who were the best of both worlds, being smart while still bearing an uncanny resemblance to Zack Morris.
We should also point out the study was carried out by scientists who were almost certainly nerds themselves. So maybe we shouldn't be surprised if the next study is called, "An Analysis of the Prevalence of Enormous Genitalia Among Scientists (and We Do Mean Enormous, Ladies)".

For more scientific explanations of stuff you saw and heard while out drinking this weekend, check out 5 Douchebag Behaviors Explained by Science. Or for examples of how weird shit can get when these myths go untested, check out History's 10 Most Terrifying Contraceptives.

Estudio sobre los cumpleaños

Birthday study

It is proven that the celebration of birthdays is healthy. Statistics show that those people who celebrate the most birthdays become the oldest.
–– S. den Hartog, Ph D. Thesis, Universtity of Groningen.

[Está probado que celebrar cumpleaños es saludable.
Estadísticas demuestran que aquellos que celebran más cumpleaños viven más años.]

The Big Bang

The Birth of Matter and Time *Part One*
This set is about the formation of our universe starting at 1.0x10^-23 of a second after the bang of the Big Bang. It's fascinating. It talks about the battle between matter and anti-matter, how energy was transformed into matter and how atoms didn't exist until shortly after the big bang because the electrons were moving too fast...there's a lot more.