The Reason WD-40 Was Developed

The WD-40 formula was developed by 3 scientists who succeeded in their goal upon the 40th design attempt, with the name WD-40 being an acronym meaning “Water Displacement: 40th Formula”. WD-40 was created in 1953 by the Rocket Chemical Company located in San Diego, United States of America. The formula was originally researched and developed as a means to protect the outer skin and thin tanks (e.g. lightweight pressurized tanks which provide structural support when filled saving weight overall) of SM-65 Atlas intercontinental ballistic missiles from rust and corrosion during the manufacturing, handling, and storage process(es) of missile silos. This proprietary mixture resolved for the aerospace industry the need for a dependable water displacing solvent which prevented moisture and other related damage. Early use of WD-40 upon Atlas SM-65 missiles demonstrated the solutions superior effectiveness in comparison to analogs. This prompted a handful of employees to take canisters of WD-40 home which inadvertently inspired the projects founder, Norm Larsen, to package WD-40 in an aerosol form designed specifically for consumer use. WD-40 first appeared on store shelves in 1958 and developed applications in spacecraft maintenance, disaster recovery, and countless home and industrial tasks (eg. lubricating stuck hinges of seized doors, displacing moisture upon electrical contacts, loosening rusted and/or seized bolts etc.)

The Status Symbol of Keys Within the Ancient Roman Empire

Metal keys first appeared during the Ancient Roman Empire and were viewed and often flaunted during the period as an indicator of wealth and/or elevated social status, as Ancient Roman keys were typically comprised of bronze or iron, occasionally worn as decorative jewelry (e.g. rings, bracelets, belt attachments etc.), and used primarily to secure high value items (e.g. jewelry boxes, document cases, coin chests etc.) making them both functional tools but also visible reminders of social status and income. Because only the wealthy could afford metal keys within the Ancient Roman Empire, lower socioeconomic classes relied upon more simplistic, wooden lock mechanisms and in many cases left valuable possessions unsecured entirely. Some Ancient Roman keys featured intricate designs (e.g. animal motifs and geometric patterns etc.), personalized and designed to reflect the predilections of the owner of the key and the lock it is designed for. The Latin term for key, which is “clavis”, evolved and came to mean “code” or “solution” over time, which is notable because it demonstrates the period when physical access and security and intellectual access and security became conceptually correlated with one another. Archaeologists and historians have recovered metal keys from Ancient Roman villas, balneae (pronounced “bahl-neh-eye”) which are bathhouses, and burial sites, often discovered alongside personal items (e.g. grooming tools, coins, small religious tokens etc.). The modern day concept of personal security and having exclusive access to one’s belongings and/or information traces its origins back to these early locking mechanisms and keys as what began as a practical intervention for safeguarding valuables laid the foundation for the modern day systems of privacy, ownership, and controlled access to sensitive and/or valuable information or objects

The Architecture Which is Most Resilient to Earthquakes

During the Chilean earthquake of 2010, very short buildings (e.g. 3+ stories) and very tall buildings (e.g. 25+ stories) were virtually unaffected, with the bulk of damage pertaining to buildings which were 10 – 20 stories high. The reason why shorter and taller buildings are able to withstand earthquakes with greater chances of survival is because earthquakes have natural rhythms which are frequencies. Crustal earthquakes have a high frequency like choppy water, and thus shorter and taller buildings are not affected. Subduction earthquakes move much slower in their rhythm and frequency with approximately 1 swell/cycle per 1 second, which causes sizeable damage to mid sized buildings. 10 – 20 story buildings tend to vibrate at 1 swell/cycle per second which causes a dangerous synchronicity in the vibrato as the rocking becomes more intense in its amplification with each additional second or swell/cycle, until the earthquake stops or the building collapses. Taller buildings sway much slower which gives them a lot of built in protection against even the largest earthquakes found throughout history

The First Assassination With a Firearm

The first assassination using a firearm was of James Stewart the Earl of Moray, in 1570, who was assassinated by James Hamilton. Hamilton stalked Stewart for weeks, following him from Perth, Scotland to Stirling, Scotland, and finally pouncing when in Linlithgow, Scotland. Hamilton was well prepared, hanging a black cloth textile behind him so that his shadow could not been seen upon the street and putting down bird feathers to muffle the sound of his movements. As Stewart rode by, Hamilton raised up his weapon, a short barreled hunting carbine, and fired, hitting Stewart in the stomach. This shot caused much confusion but by the time Stewart and his entourage had figured out what occurred, Hamilton was long gone, as his escape route was pre-planned. Stewart managed to stumble to the home he was staying but died later that same evening. Hamilton was never caught for this crime but the entire act is immortalized in stained glass at Saint Giles’ Cathedral in Edinburgh, Scotland. This assassination caused chaos in Scotland and made the English court immensely nervous as bodyguards were no match for a distant assassin within the shadows who could pick off their target and vanish without a trace. Firearms were deemed during this era a threat to national security in Europe, especially after the advent of the wheel lock mechanism in 1515 which was a mechanized method of igniting gunpowder, allowing for the design of the pistol to work in practice for the very first time

The First Female Sculptor Within Italy During the Renaissance

Properzia de Rossi, who was born in Bologna, Italy in 1490, aspired to become a sculptor and was the first female marble sculptor within Italy during the Renaissance of the 16th century. Although de Rossi left no diaries, fragments of her early work are still available during the modern day. Despite marble sculpting being viewed as a masculine art form during the Renaissance in that it required muscle to perform and an intelligent mind to create, both of which women were not thought to possess during this period. Because of this, de Rossi found her medium in other art forms, most notably her “Madonna of Mercy” within the Grassi Family Crest work which was a silver crest with 11 nectarine buttons which were carved intricately with small images of religious piety. By 1525, aged 35, de Rossi entered a contest for the main cathedral basilica of Bologna, San Petronio, of which she won. The piece was named “Joseph and Potiphar’s Wife” which depicts a fallen women who’s breasts are exposed, rising off of her bed to try and claim her husband as he leaves. It was believed during the period that it was unthinkable for a woman to study the male nude form through nudity. Because de Rossi’s sculptures were so accurate, it was assumed she knew too much of the male form and therefore she was dammed for her talent. In 1530, de Rossi died penniless and alone, a retched end for a great artist who was pushed out of society due to the sheer beauty and creativity of her work. Had de Rossi not been a victim of her time, she would have been celebrated with the most revered male Renaissance artists

The Reason Women Were Forced Into Caretaking Roles Throughout History

In early hunter gatherer societies, women played a crucial role in providing sustenance within their communities. Women were responsible to gather fruits, nuts, and roots, developing extensive knowledge of plant life, seasonal patterns, and medicinal herbs as these are all necessary skill sets for foraging. As societies expanded in order to sustain their growing populations, women became less and less relevant as they were viewed as unfit for agricultural work or to participate within battles and wars, and because of these factors and because virtually all societies shifted toward agriculture, women gradually lost their ability to gather and became increasingly dependent upon the wealth and provisions of their husbands. The rise of warfare in expanding civilizations meant that warriors who were almost exclusively male gained access to even more control over resources and decision making within society. This forced women into the role of caretakers. With agriculture came the concept of land ownership, which was almost exclusively controlled by men, further solidifying male dominance of society. As permanent settlements formed, men took control of agricultural work, domestic trade, and governance, whilst women were confined to domestic responsibilities due to generations of marginalization and conditioning. Over the coming centuries, religious, cultural, and legal systems reinforced these divisions, ensuring that women remained economically and socially subordinate in perpetuity

The Reason the Catacombs of Paris, France Were Created

There are over 300 kilometres of underground passages underneath Paris, France as underground quarries were made due to the large demand of stone it took to build the city. The catacombs beneath Paris hold nearly 6,000,000 (6 million) human skeletons. During the 18th century, death was quite common and the cemeteries quickly filled up. As such, the city of Paris decided to empty the cemeteries and place the bones underground. The bones were tidied up by making them into walls by stacking skulls and humerus arm bones on top of eachother, making each piece fit in the groove of the next. The collection of bones beneath Paris is essentially the Medieval population of Paris

The Development of Lock Hospitals Within England for Female Sex Workers During the 19th Century

Due to the fact that sexually transmitted infections and diseases were rampant among English soldiers, in 1864 novel legislation entitled the Contagious Diseases Act was passed which permitted any woman suspected of prostitution as young as 13 years of age, to be forcibly examined by a physician. Institutions referred to as “lock hospitals” were established and setup so that women suspected of spreading disease could be detained and examined, and if they were positive in their evaluation, they could then be incarcerated for up to 3 months. It never occurred however to the English government that men could also spread sexually transmitted infections and diseases which is why men were immune from this legislation and a key reason as to why the problem was never resolved. Because of this, in 1886, this legislation was repealed

How Flames Were Artificially Produced for Opera Productions During the 18th Century

During the 18th century within opera and theater productions, stage doors which would lead a character to Hell achieved simulating the flames of Hell with brandy which would be placed into a container and lit on fire due to the fact that during the period, brandy was the brightest glowing flame available because of it’s high alcohol content. Once the brandy was burning bright, a powder referred to as “lycopodium” was blown across the flames to create an intense illumination, creating a fireball of sorts. It was in truth a very dangerous special effect to achieve because of the wooden sets, the actors involved, and the enclosure of the theatre itself. Most of those who performed the pyrotechnics for operas and plays during this period were ex-military, often soldiers who understood how these chemicals worked in depth as rocket technology was at the cutting edge of warfare during the era

The Original Version of the Statue of Liberty

The Statue of Liberty was provided as a gift to the U.S. from the French public to celebrate the U.S. French alliance during the Revolutionary War. This gift however was not originally designed for the U.S., as its sculptor Frederic Auguste Bartholdi (pronounced “fred-reek ah-goost bar-told-ee”) had traveled to Egypt to pitch the idea of an enormous woman like the Statue of Liberty, standing at the entrance of the Suez Canal. This original design was to be veiled to comply with then Egyptian values, and holding a lantern representing Egypt carrying the light of progress into Asia. Initially the Egyptian government liked this idea but because the cost was exorbitantly high, plans were eventually scrapped. Bartholdi redesigned his concept to depict a Roman goddess which is more European and therefore palatable to the U.S. conscious. In addition to this, Bartholdi also wanted to ensure that this new design represented freedom, not progress, to reflect American sentiment during this period