More than 4,500 several years ago, Finnish potterymakers detected a stone made of thin fibers that desegregated really well with the clay theyused to utter pots. This stone was so strong, and hitherto adaptable, that they could use it to make their pots thinner and bigger than ever. Plus, it wassurprisingly resistant to heat, so the utensils could contain things like sizzling metal. It seemed like a supernatural stone, and eventually, the ancient Greeks, Romans, and Egyptians all started exercising it, too. That boulder was what we now call asbestos, andeventually, we found out that it was too good to be true and stopped employing it so much better. But that made a while.The statement asbestos actually referred to above six differentminerals that all have the same habit, or method that their crystals grow. Theyre called asbestiform, which time meansthat they proliferate in long, thin, adaptable fibers. That flexibility, plus their strong andresistance to damage by hot and draconian chemicals, seen these minerals fantastically handy in industry.The question is, breath asbestos fibers can be dangerous. Because to your lungs, those flexible fibersare more like sharp-worded little shards. You are likely imagine what happens if youbreathe them in: they get stuck in the mucus rowing of your lungs, which can make it difficultto breathe.Inhale too many shards over day, and theycan cause diseases like asbestosis, or scarring of the lungs, and mesothelioma, a type oflung cancer. The different forms of asbestos with the highest healthrisks are a part of a group of stones called amphiboles, and what stimulates them induce morehealth problems than others comes down to four of their chemical and structural properties. First, amphibole fibers are smaller, so theycan passage deeper into the lungs. Theyre likewise sharper, so we are to be able to pierceyour lungs more easily, making inflaming or making blemish material. Plus, theyre hydrophobic, or water-avoiding, which can keep them from dissolving in mucus — if they evaporated, they could be coughedup and get out of your system.Finally, they contain iron, which are capable of reactwith oxygen in your lungs and injury the DNA in your lung cadres. The damaged DNA can then attain the cells todivide too quickly, leading to a tumor. So they may be more carcinogenic, or cancer structuring, as well. So, how did asbestos run from being the miracle-rockof ancient potters to the scourge of modern industry? Even as far back as the Roman Empire, some2, 000 several years ago, historians wrote about slaves coming what they called a sickness ofthe lungs after working in the area of asbestos mines.And when the first commercial-grade asbestos minesopened in Quebec in 1879, asbestos-related health publishes started indicating up in medicaljournals and action reports. One of the first well-studied fatalities was in1 924 in the UK. Nellie Kershaw, whod been spinning asbestos into fibre since she was1 3, died at the age of 33 from asbestosis. When Parliament heard about the occurrence, theyasked a doctor known as E. R. A. Merewether to investigate the health of asbestos workers. For two years, he studied 374 proletarians at anasbestos textile factory.He found that inhaling asbestos fibers justification scarring in the lungs– and 17 out of 20 workers who had been there for more than 20 years intent up with asbestosis. Merewether presented the working paper to parliamentin 1930, and the UK started requiring breathing in asbestos plants a year later. But it wasnt until 2003 that asbestos wasbanned right across the european union. The asbestos industry in the United Statesis a whole other narrative. Asbestos was used a lot during World War II, since it was cheap, strong, and resistant to fire and compounds. Naval war carries usedasbestos isolation, and builds were constructed with asbestos floor tiles, shingles, cements, and isolation for tubes. Production of asbestos in the United Statesfinally started to slow down 1979, when nine asbestos creators entered a litigation againstthe federal government departments. In 1975, theyd paying $69,000 to an asbestosworker who developed asbestosis, and they wanted to be reimbursed. But the government wouldnt have any ofthat. Instead, they proved that the companies knew about, and had been obstructing, asbestos-relatedhealth information for decades. The event got a lot of media attention, andpeople started to try to fix the problem by removing asbestos from buildings.But theUS still hasnt absolutely censored the use of asbestos. Even so, asbestos wont effect health issuesfor most people. Most of the fibers are so tightly tied intoanother material that they won’t escape into the air unless youre trying to remove theasbestos. Plus, each year we each breathe about a millionfibers precisely from the natural corrosion of asbestos-containing boulders. So unless youre an asbestos work whosspent a lot of years without a breathing mask, or youre an ancient Finnish potter, you probably dont have to worry about getting an asbestos-related illness.Thanks for watching this episode of SciShow, which was brought to you by our patrons on Patreon. If you want to help support thisshow, just go to patreon.com/ scishow. And dont forget to go to youtube.com/ scishowand subscribe !.