Despite the Romans using lead water pipes, lead poisoning from the water supply system was almost nonexistent since the high calcium content in their water created a layer of plaque preventing the water contacting the lead itself. en.wikipedia.org/wiki/Plu…
There’s no β€˜correct’ side of aluminum foil to use when cooking. The difference between the two sides is due to a manufacturing process. Two layers of foil are pressed together and milled at the same time, because otherwise, it would break. rd.com/food/fun/real-reas…
Stars don’t actually twinkle. Light rays penetrate through different layers of air, distorting the brightness. That’s atmospheric Refraction. ck12.org/book/cbse-physic…
Scientists determine a blue whale's age by counting the layers of it's earwax. api.nationalgeographic.co…
A team of international scholars have been working to recreate recipes from 4000 years ago from tablets. One Mesopotamian dish resembles a chicken pot pie, with layers of dough and chunks of bird smothered by a sort of Babylonian bΓ©chamel sauce bbc.com/travel/story/2019…
Forest fires can "hibernate". When a forest fire burns hot enough, what’s left of the fire can sit over winter and smoulder, even under a layer of snow. edmontonjournal.com/news/…
The Bulgarian city of Plovdiv is Europe's oldest city, at some 8000 years old. It's so old that the city sits on about 39 feet of ruins from past cultural layers of the city's development. en.wikipedia.org/wiki/Plo…
Rust does not cause tetanus infection. The Clostridium tetani bacterium that causes tetanus requires anoxic conditions to reproduce and these are found in the permeable layers of rust. ehso.com/disease/tetanus.…
The extra layer of skin over the eye of 90% Asiatic people is called the "epicanthic fold" and is theorized to have evolved as a protection against cold and snow blindness. en.wikipedia.org/wiki/Epi…
Today I learned of the old jewish cemetery in prague. Dating back to 1478, it has gotten full so many times and they just kept adding layers. Now there are 12 layers of graves stacked on top of each other. There are about 12,000 visible tombstones but over 100,000 people buried there. jewishmuseum.cz/en/explor…
Most of the world don't refrigerate their eggs. Some wash their eggs the minute they are laid to which prevents salmonella. In the places that don't wash their egg they leave the protective layer (cuticle) on allowing eggs to stay out. womenshealthmag.com/food/…
If you put water droplets on a hot pan they never actually touch the pan. A vapor layer forms that makes them float. This phenomenon is an example of the Leidenfrost effect. wikipedia.org/wiki/Leiden…
Vindaloo (curry) originated from Portuguese sailors, carne de vinha d'alhos ("meat in garlic wine marinade"). The basic structure of the dish was "preserved" raw ingredients, packed in wooden barrels of layers of pork & garlic, soaked in red wine. This was "Indianized" by the local Goan cooks. en.wikipedia.org/wiki/Vin…
A passenger was turned away from two flights because he was wearing 10 layers of clothing to avoid extra luggage fees vice.com/en_au/article/8x…
Today I learned of a lake in West Papua, Indonesia that is filled with jellyfish. These jellyfish have such a minor sting that tourists visiting the island can swim among the jellyfish without any protection. The lake also has a toxic hydrogen sulfide layer that prevents deep diving activities. nationalgeographic.com/ne…
A volcano 200 years ago killed at least 10,000 people in Indonesia and coated earth in a climate cooling layer of ash that blocked the sun nationalgeographic.com/ne…
Australia has the highest rate of skin cancer because of a hole in the ozone layer. medicalxpress.com/news/20…
Today I learned about Witness Trees. These are trees that were present during key moments in American history. They have been known to hide bullets from those events within new layers of wood and bark. To help preserve their historic relevance, a Witness Tree Protection Program was launched in 2006. smithsonianmag.com/travel…
The Saturn V rocket carrying the Apollo 12 mission was hit twice by lightning. 36.5 seconds after launch. lightning hit as it ascended the cloud layer, setting off alarms due to guidance systems errors. 15 second later it was hit again and instruments no longer displayed meaningful information history.nasa.gov/afj/ap12…
2-ply toilet paper isn't always twice the thickness of 1-ply toilet paper. 1-ply paper is made of one layer of 13# (13-pound) thickness paper while 2-ply is made of two layers of 10# thickness paper. web.mit.edu/barryk/Public…
In the 19th century, profit-maximizing recipe used by milk producers was a pint of lukewarm water for every quart of milkβ€”after the cream was skimmed; To whiten the bluish liquid they added chalk and to replace skimmed-off layer of cream, they might add a final flourish of pureed calf brains theatlantic.com/magazine/…
When Alexander the Great’s dearest friend Hephaestion died, Alexander threw him a lavish funeral worth around Β£1,500,000,000. He also had a 60-metre-high pyre commissioned, with 7 layers of golden objects. Hephaestion was also worshipped as a divine hero. Shrines were erected in his memory. en.wikipedia.org/wiki/Hep…
When horses are born, their hooves are covered in a rubbery layer called a deciduous hoof capsule. This capsule covers the sharp edges of the foal’s untried hooves, protecting both the foal and its mother from injury during birth. The capsules fall off soon after birth. honesttopaws.com/newborn-…
The Ozone layer is healing and is expected to do a full recovery by 2060. bbc.com/news/newsbeat-461…
You should never wash a cast iron pan with soap because it can strip off the oil you've baked and cooked into the dish. Also, when you first get a cast iron, you need to "season" it by baking oil into it and each time you use it, the layers of oil and flavor will build. hunker.com/12433041/what-…
Information about Earth's magnetic field such as intensity and direction are stored in certain minerals present in sedimentary rock. Using the data present in different layers of rock, scientists are planning to reconstruct the advancement of this magnetic field over time. apexmagnets.com/news-how-…
Just found out that OLED and other display technology screens can be transparent and we only add a black screen/layer behind it so we can see. youtube.com/watch?v=0aw58…
There are trees that have bark that peels away to reveal a second layer of colorful bark, making a rainbow like effect missouribotanicalgarden.o…
Clownfish are covered in a layer of mucus which acts as a protective shield from the harmful tentacles of anemones, giving them immunity to stinging tentacles asknature.org/strategy/mu…
A passenger was turned away from two flights after wearing 10 layers of clothing to avoid baggage fees telegraph.co.uk/news/2018…
The Heaviside Layer, best known for having to do with reincarnating cats in the musical "Cats," is real, and is the reason why you can hear further radio stations at night. en.wikipedia.org/wiki/Ken…
Tardigrades, or water bears, were filmed mating for the first time in 2016 by German researchers. The female lays eggs, the male gets into position (a process that can be several minutes); they engage in mutual stimulation till the male ejaculates his semen into the female's outer layer of skin. bbc.com/earth/story/20161…
In 1881, a doctor discovered that a silk handkerchief in a dead man’s pocket had greatly reduced the penetration of a bullet. The doctor was fascinated and created a silk bulletproof vest with 30 layers of cloth. He stopped his research afterwards. Another man invented the vest. culture.pl/en/article/the…
The Ozone layer will make a full recovery within 50 years. edition.cnn.com/2018/11/0…
Only the outer layer of tree trunks are alive. The center of the trunk is technically dead but it will not decay or lose strength while the outer layers are intact. A piece of the dead core 12" long and 1" by 2" in cross section set vertically can support a weight of twenty tons. arborday.org/trees/RingsT…
4-dimensional printing uses the same techniques of 3D printing through computer-programmed deposition of material in successive layers to create a three-dimensional object. However, 4D printing adds the dimension of transformation over time. It is therefore a type of programmable matter. en.wikipedia.org/wiki/4D_…
2 aspects of dual process theory argues our consciousness actually includes 2 layers- The implicit portion- the part of your mind that reacts/responds automatically, or without conscious thought. The aspect of your consciousness that is truly conscious and controlled is the explicit portion. en.wikipedia.org/wiki/Dua…
In 2010 competitive swimming banned polyurethane suits in swimming that could reduce drag up to 8%, after records were broken in droves. The thin layer of fabric was made up of tiny bubbles that trapped air and actually made the swimmer float higher in the water. thedailybeast.com/why-ban…
Today I learned of the Golden Buddha. A solid gold statue of The Buddha, weighing five and half tons, which was covered with a layer of stucco and coloured glass to conceal its true value, and remained hidden for 200 years before being rediscoverd during renovation in 1955. en.wikipedia.org/wiki/Gol…
Cuckoo wasps, like their namesake the cuckoo bird, are kleptoparasitic, having evolved to lay their eggs in the nests of other species of wasps. Their brilliant metallic colors are produced by light refracting through open spaces between six layers of cuticle in the wasps’ exoskeletons. baynature.org/article/the…
Israeli researchers have made a 3D-printed heart by converting fatty tissue from human patients to form "bioink" which built the heart layer by layer. Around the size of a rabbit heart, it contains cells, blood vessels, chambers, and other structures a heart needs to function normally. nbcnews.com/mach/science/…
Today I learned about Polar Stratospheric Clouds β€” Rare clouds that look like a glitch in the matrix and harm Earth’s ozone layer. theconversation.com/expla…
In London in 1952, a moist layer of fog mixed with chimney smoke to create deadly, thick smog that killed at least four thousand people. metoffice.gov.uk/weather/…
A possible inspiration for the dessert Baklava might have been the unfortunately named "placenta cake," an ancient Roman dish with several layers of dough, cheese, honey and bay leaves. en.wikipedia.org/wiki/Bak…
The Rolls-Royce Phantom has a layer of foam inside its specially-designed tires, which lowers cabin sound levels by reducing tire cavity noise. en.wikipedia.org/wiki/Rol…
The ozone layer is healing and a full recovery is expected by year 2050-2060 nasa.gov/feature/goddard/…
In order to stay hydrated, sea snakes drink a thin layer of fresh water that collects on the surface of the ocean, called a "lense", after rain storms and do not drink sea water as previously thought. futurity.org/sea-snakes-w…
Our palms and soles of feet cannot tan like the rest of our bodies regardless of how much sun they are exposed to. This due to a thick layer of dead skin that prevents UV rays from being exposed to the living cells popsci.com/scitech/articl…
Japanese police wear white gloves since the Beatles’ visit in 1966 when the responsible police chief decided to add a layer of propriety between police officers' hands and crowds of mostly young women japantimes.co.jp/news/201…
Because Amsterdam’s soil consists of a thick layer of fen and clay, all buildings are built on wooden poles that are fixed in a sandy layer that is 11 meters deep on average. The Royal Palace at Dam Square is built on no less than 13,659 wooden poles. awesomeamsterdam.com/10-f…
There are 2x connections going back to the eyes. The cortex sends a cascade of predictions about what should be seen at all the different layers of complexity. So what travels back up from the eyes is not raw visuals of the environment, but how the world deviates from what the brain is expecting theatlantic.com/technolog…
Those β€˜eye squiggles’ are shadows of things inside your eye. Floaters are small clumps of gel or cells inside the clear jelly-like fluid that fills the inside of your eye. Squiggles that you see are shadows they cast on the retina, which is the layer on the back of your eye that senses light. umkelloggeye.org/conditio…
Today I learned of a Japanese sweet snack called "English toast", which is neither English nor toast. It consists of two slices of white bread, covered with a layer of margarine, sprinkled with sugar and put together. soranews24.com/2014/11/22…
The term "destruction layer" is used by archaeologists to identify strata with evidence of violence and destruction of a city en.wikipedia.org/wiki/Des…
The world's largest ball of paint is in Alexandria, Indiana. The creator added a layer of paint to a baseball everyday since 1997. It is now over 14 feet wide and weighs 2.5 tons roadsideamerica.com/story…
Most Converse sneakers have a very thin layer of felt applied to their soles, in order to legally classify them as slippers. This saves the company more than 33% in import tariffs. smithsonianmag.com/smart-…
Today I learned of matpakke (food package, or packed lunch), which is the most popular lunch choice for Norwegian students and workers. Individual slices of brown bread, topped with an additional ingredient (often liver pate, brown cheese, or jam), are separated by mellomleggspapir, or between-layer wax paper. bbc.com/worklife/article/…
Rian Johnson wanted to show extreme violence in The Last Jedi's final battle, but couldn't do so in a PG-13 movie. To solve this, the planet Crait was covered in a layer of salt which, when displaced by the fighting, revealed a red landscape and made the battlefield appear drenched in blood. cinemablend.com/news/2302…
Nuclear Winter: Global precipitation would drop by around 45%. Surface temperatures plunge 17F to 20F. Almost nothing would grow, ensuring starvation. The depleted ozone layer allows ultraviolet light to surface. A Caucasian person couldn’t go outside for a few minutes before getting a sunburn. vox.com/future-perfect/20…
The deepest hole drilled by humans into the Earth is a bit over 12 km. If the Earth was an onion, that would be the equivalent of the first layer of skin. en.wikipedia.org/wiki/Kol…
During WW2, Bicycle (card company) smuggled escape maps in their card decks to help allied POWS escape from German POW camps. To reveal the map, a card was soaked in water as to separate the two paper layers that make up the cards. The map was on the insides of the card. amp.businessinsider.com/p…
In the centre of Nagasaki's Peace Park is simple, black monolith that marks the epicenter of the atomic bomb's explosion. Furthermore, there is an area that allows visitors to take a look at a layer of soil below the park's surface where broken roof tiles, bricks and pieces of glass japan-guide.com/e/e4400.h…
Germans soldiers in WW2 executed Jews in a manner known as "sardines" , so as to lay one layer of bodies after the other in the opposite direction to maximize bodies per grave; often forcing still living people to lay on the bodies of the dead before themselves being shot en.wikipedia.org/wiki/D%C…
A deep sea snail known as the Scaly-Foot Gastropod, which was only recently discovered in 2001, has a shell so well constructed that the U.S. military is researching its design, hoping to incorporate its defensive layers to improve military armor. leisurepro.com/blog/explo…
The Montreal Protocol is the first treaty to be universally adopted by all countries in the world, and as such the Montreal Protocol’s Scientific Assessment Panel believes the Ozone layer will be nearly fully recovered the middle of the century. state.gov/key-topics-offi…
Today I learned about Boundary Layer Fences, which increased horizontal stability in early jet aircraft, as well as preventing the entire wing of a given craft from stalling all at once en.wikipedia.org/wiki/Win…
Today I learned about Fordite: layers of hardened automobile paint taken off factory floors that are cut and polished and can be made into jewelry. en.wikipedia.org/wiki/For…
By lighting a fire in an igloo the fire inside melts the inner layer of ice, and the cold outside refreezes it adding a layer of insulation that can keep the igloo at 20Β° inside while it's -50Β° outside. physlink.com/education/as…
There are a billion missing years in earth's rock layers -- one theory is that Snowball Earth, where miles of ice eroded those rock layers and sent the sediment into the oceans where they were plunged back into the mantle to be recycled -- there are also no fossil layers before this period eos.org/articles/erasing-…
Cultured pearls only have a thin layer of nacre (the pearly calcium carbonate) over a non-pearl body while natural pearls are nacre almost all the way through. en.wikipedia.org/wiki/Cul…
Some fish have skin made up of alternating layers of guanine crystals & cytoplasm. This means that unpolarized light is reflected, but also that more light is reflected, a useful adaptation for an animal that uses its silvery shimmer to hide in light filtering down from the surface. blogs.nature.com/news/201…
The oldest footwear ever found and accurately dated was in Fort Rock Cave, Oregon, USA. The sandals were dated to be between 9,300 and 10,500 years old and were found under a layer of volcanic ash. guinnessworldrecords.com/…
Scorpions glow brightly under blacklight due to a special protein found in the outer layer of their exoskeleton youtu.be/oP2oZ51YM0o
We were not the 'fastest sperm', but rather the lucky ones that reached the egg after many others have broken down the thick layers of cells protecting it. mentalfloss.com/article/2…
Drywall is called β€œDrywall” because before it, walls were made with plaster layers that were wet and took time to dry between layers. Drywall came in to the market as a faster and cleaner alternative to the β€œwet wall” process of plaster layers. activerain.com/blogsview/…
Offspring of some worm-like amphibians called caecilians allow their young to eat their flesh. The mothers of Boulengerula taitanus create a nutrient-rich fatty outer layer of skin after laying their eggs. When their offspring hatch, the babies scrape this layer off with specialized teeth. nature.com/news/2006/0604…
The Romans used to send each other little postcards made of a thin layer of flexible wood written on in ink and then folded in two. About 400 tablets (in fragments) were found near where Hadrian's wall would be built. They tell us a great deal about the nature of life on the Roman frontier. bbc.co.uk/history/ancient…
At the top soil layer, earthworms convert fallen leaves to humus. That’s a good thing if you’re growing a garden, but, in a natural forest, it causes a fast-tracking of the release of nutrients instead. Earthworms disrupt the mutually beneficial symbiotic relationship between fungi and plants earthsky.org/earth/europe…
The soil layer of the earth is called the pedosphere en.wikipedia.org/wiki/Soi…
There's enough gold in the earth's core to make a layer a foot and a half deep if it were spread on the surface. youtube.com/watch?v=oQaT6…
The Aquatic Ape Theory suggests that early hominids lived in water part of the time and accounts for our hairless bodies (streamlined for swimming) our upright, two-legged walking (made wading easier) & our layers of subcutaneous fat, which made us better insulated in water (think whale blubber) en.wikipedia.org/wiki/Aqu…
The fur fringe or ruff around the outside edge of a parka hood is not just decorative, but functional. It creates a boundary layer of still air around the face, greatly reducing heat transfer versus a non-ruffed hood. This has been proven in wind tunnel tests. int-res.com/articles/cr20…
The reason your mouth burns after eating pineapple is because there is a compound in them that both dissolves the protective layer of your mouth, and destroys its proteins simultaneously. Adding a little salt to pineapples or grilling them will help to counteract the burning sensation bonappetit.com/story/pine…
The Leidenfrost effect occurs when a liquid is contacted by substance at a temperature much hotter than the liquid's boiling point. Vapor forms immediately into a layer between the substance and the liquid. en.wikipedia.org/wiki/Lei…
Buddhist cosmology describes that after death you are born into one of 16 consecutive layers of hell based on the net sum of all your karma. As you ascend, each layer has it's own unique theme of suffering that lasts for sextillions of years....each wikipedia.org/wiki/Naraka…
Deoxygenated blood is not blue, but rather a darker red than oxygenated blood. Blood appears red in veins because the light has to penetrate through layers of tissue, making it appear blue. amp-livescience-com.cdn.a…
The layer of film in the "crisping sleeve" of many microwaved meals is officially called a "susceptor" and that the version used in one particular popular frozen meal was invented by William A. Brastad in 1981. en.wikipedia.org/wiki/Sus…
The reason we can transmit radio waves across the earth is because there is a layer, the ionsphere, that contains ionized gas which is electrically conductive and so reflects radio waves back onto the earth weather.gov/jetstream/ion…
Adventurer Robert Swan's eye color altered permanently from dark to light blue after walking through a hole in the ozone layer during his trek to the South Pole. reuters.com/article/us-an…
When something causes skin cells to release histamine, capillaries leak fluid into the top layer of the skin, the epidermis. This causes parts of the skin to swell and turn into what are called hives, which can look spongy depending on the amount of fluid released verywellhealth.com/hives-…
Oysters create pearls when they feel some sort of irritating foreign object inside of them, then layer on coat after coat of nacre as a defense mechanism, forming the pearl. thepearlsource.com/facts-…
By 2075, due to human efforts to reverse the damage, the Ozone Layer is expected to fully recover. phys.org/news172311361.ht…
Squid and octopuses don't have blind spots because the photosensitive cells in their eyes are in front of the neuron layer rather than the reverse which is prevalent in vertebrae. en.wikipedia.org/wiki/Cep…
Earth's atmosphere has a "reddish brownish layer...made of O and OH and is only seen in certain areas," says NASA Astronaut Terry W. Virts, Jr. This layer was photographed at night from the ISS on 14 May 2015 at 22:05:42 GMT while the ISS was over the Indian Ocean (latitude 5.4, longitude 50.6). images.nasa.gov/details-i…
The hole in the ozone layer is expected to be completely healed by 2050 thanks to the Montreal Protocol signed in 1987, limiting the use of CFC's smithsonianmag.com/scienc…
Today I learned of the Novaya Zemlya effect, where the sun can be seen, due to a polar mirage between thermal atmosphere layers, prior to the end of the months long polar night. There is research suggesting the Vikings used this effect to discover Iceland and Greenland. en.wikipedia.org/wiki/Nov…
Snow and ice are only slippery because of a 4 molecule thick layer of water that is always present at the surface down to as cold as -30C; below -30C it becomes a true solid and skating and skiing are extremely difficult technology.org/2017/12/01…
There is a layer of sodium atoms in the upper atmosphere left behind when meteors burn up. This layer is used by astronomers to create guide stars that allow them to correct distortions caused by the atmosphere. Shooting stars make our telescopes better! en.wikipedia.org/wiki/Sod…
Today I learned of the Iron Pillar of Delhi, an ancient, 23 ft solid pillar of near pure iron, that has resisted corrosion due to an unusual corrosion resistant layer. It also survived a direct canon ball strike in the 1700s from Muslim invaders. en.wikipedia.org/wiki/Iro…

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