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  • Hi, I’m Craig. Shampoo has come a long way since 1882. Back then, one of the leading

  • shampoos Slidall’s Soap billed itself asThe Soap for All Uses”, and boy did it

  • stretch that claim. Not only was it marketed as a cleaner for hair and body, but the ads

  • also suggested using it to clean your toilet, laundry, kitchen counters, babies, dogs, harnesses,

  • carriages, and both natural and artificial teeth. And that’s just the first of many

  • FLAKY facts the scientists at Head & Shoulders are helping us clear up. I hope I don't MOUSSE

  • this up. This is going to be BUN, I mean, FUN. ‘Cause your hair is in a bun

  • you know what I’m talking about.

  • Shampoos have become way gentler since the 1800s, and the formulas have gotten smarter

  • in the 125 years since then. But why do people even shampoo in the first place? One of the

  • reasons we need the lathery goop is that human scalps are basically waterproof. Glands underneath

  • our skin manufacture sebum, an oily substance that coats hair follicles. In the process,

  • sebum makes hair clump together and appear greasy. But because sebum is so good at waterproofing

  • the hair shafts, a phrase I never thought I’d say, a mere shower or bath won’t do

  • much in the way of actually cleansing the scalp.

  • To get past those waterproofed hair shafts, shampoos contain two-faced chemical compounds

  • called surfactants. Half of each surfactant wants to dissolve in water, and the other

  • half wants nothing to do with H2O. When hair meets water that has interacted with surfactants,

  • it creates a party where everyone’s invited, including sebum, dirt, grime, Gary from down

  • the hall. That’s what the lather is there for. Not only does it make your head feel

  • like a root beer float, it washes away clean, taking all the gunk and previously non-water-soluble

  • matter with it.

  • In 1908, New York’s biggest papers started publishing columns onHow to Shampoo the

  • Hair.” That’s because most people in the world didn’t know how to shampoo their hair.

  • So that was good of them, giving the people what they need. That’s what the media always

  • does. Always. The piece suggested washing your hair once every two weeks instead of

  • the more common practice of once every six weeks.

  • Of course, bathing itself, wasn’t that popular in history. Partially because everyone wanted

  • to act royal, and kings and queens HATED taking baths. Louis XIII liked to brag, “I take

  • after my father. I smell of armpits!” Henry VIII could literally be smelled from three

  • rooms away. And Queen Elizabeth I proudly declared that she took a bath, “once a month,

  • whether she needed to or not.” Were guessing she needed to.

  • How many times a week should you be shampooing? According to experts, two or three times a

  • week is a good rule of thumb. You should also clean your thumb. According to me. Of course,

  • certain conditions demand more or less shampoo. If youve got malassezia globosa up there--

  • the scalp fungus that causes dandruff, you might need to scale it up to keep them flakes under control.

  • Ever wonder why there’s silicone in your dandruff shampoo? Polymers like silicone are

  • added to all sorts of shampoos to safely re-coat the hair cuticles after theyve been cleaned.

  • The coating smoothes them down and adds a lubricating and protective sheath to keep

  • your hair feeling healthy.

  • Shampoos also get fancy with their polymerssome add volume or weight or increase the shine

  • and feel, while others protect from things like UV raysbut, in essence, they all work

  • like waterproofing sealant on a deck. Don’t host barbecues on your hair, okay? Yowza.

  • Ever wonder how astronauts wash their hair in space? NASA gives them a rinseless shampoo

  • that you simply apply and towel dry. But the no fuss shampoo wasn’t created in a NASA

  • lab. It was originally developed for hospital patients who couldn’t take showers.

  • That’s not the only shampoo technology invented for the sick. To reduce the burden on nurses

  • and careworkers, Japanese scientists developed a shampoo robot in 2011. The gadget scans

  • the scalp, determines how best to apply pressure to your head, and then works the suds through

  • with its eight magical fingers. That’s awesome!

  • It’s easy to overlook how much testing goes into many shampoos. According to one scientist,

  • the tools in her lab include a controlled humidity room to analyze whether a new formula

  • will make her hair frizz up, a fragrance center to experiment with how scents are released

  • with water, a special comb that measures the force it takes to detangle freshly shampoo-ed

  • wet locks, a friction apparatus that simulates what people feel when they play with the tips

  • of their hair, and a lathering center to determine just how many suds your perfectly calibrated

  • shampoo should have.

  • The shampoo you get in the US is probably a little different from the same stuff you

  • get in other countries. Shampoo makers adjust their formulas because water quality fluctuates

  • depending on where you live. Hard water, for example, has higher mineral and deposit content

  • that can overwhelm a surfactant, so other chemicals have to be added to the shampoo

  • to counteract the ions that make the surfactants ineffective.

  • Since the 1960s, scientists have been fascinated with shampoo’s fluid dynamics. It was those

  • crazy free-wheelinfluid dynamic ‘60’s. Like many fluids, shampoo coils up as you

  • pour it onto a surface and the liquid slowly moves downward. But then, every once in a

  • while, the shampoo stream will bounce up like a rubber ball. BOING! That uncanny behaviour

  • is called the Kayes Effect, and it took scientists about 40 years to explain the mechanism.

  • You want another strange and wonderful thing about shampoos? Because shampoos are good

  • at breaking down body oils, putting a dab on the inside of your shirt collar can help

  • clear away your greasy collar stains.

  • Recently, American scientists discovered that by using a tweaked shampoo recipe on old woolly

  • mammoth hair, they could remove the extraneous bacteria from the strands and get clean DNA

  • samples. The discovery has helped them to declare a new species of woolly mammoth, and

  • theyre eager to use the shampoo on other museum animals. I mean, I’ve been doing

  • that for years. But I got kicked out. I discovered some stuff. I’m not going to tell you about it though.

  • Finally, I return to the salon to tell you that baby shampoos are just shampoos that

  • use milder surfactants and don’t have special polymers or moisturizing agents, as a matter

  • of surfact. Babiesglands create sebum at a much slower pace than adults’, so their

  • hair is usually less oily and greasy. Also theyre wittle babies who have no say in

  • what their parents put in their hair, so the joke’s on them. HA. You got no options, kid!

  • Thanks for watching Mental Floss on YouTube, made with the help of these flaky people.

  • And thanks again to Head & Shoulders for helping us make this episode possible. And to Sofia

  • Vergara, whose flake-less flowing hair was an inspiration for every single fact in this

  • episode. Except the one about Baby Shampoo. That was inspired by a dandruff-free baby.

  • A random oneyou know which one you are.

Hi, I’m Craig. Shampoo has come a long way since 1882. Back then, one of the leading

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16のシャンプーの事実(Incl.なぜあなたのシャンプーにシリコンがあるのか!) - mental_floss - リストショー (302) (16 Shampoo Facts (Incl. Why There's Silicone In Your Shampoo!) - mental_floss - List Show (302))

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    Wendy に公開 2021 年 01 月 14 日
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