Wikipedia:Reference desk/Archives/Science/2015 June 18 Diy

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June 18

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Maps, Directions, and Place Reviews

hair loss breakthrough

Can I know whether the research as described in this article http://www.mirror.co.uk/news/technology-science/science/cure-baldness-hopes-raised-scientists-2476939 still going on ? Can you please tell me about the progress if you don't mind ? It looks awesome and revolutionary! -- Preceding unsigned comment added by 54.240.197.233 (talk) 06:54, 18 June 2015 (UTC)

Flapper Headband Diy Video

Mothballs as a "preservative" for books

Is naphthalene a good idea for protecting valuable books being stored for a few years? I have several valuable books that I need to put away for a few years - due to lack of space in my current home for a suitable bookshelf. If I wrap the books in plastic (polyethylene) with a few mothballs in the package, would they be safe? If naphthalene is harmful to paper what is a better, but still easily obtainable, alternative? Roger (Dodger67) (talk) 09:32, 18 June 2015 (UTC)

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dogs recognizing dogs

How does one breed of dog (let us say a small dog, still knows that a large dog (let us say a great dane) is still a dog. They do not look alike, but still they act agressively and smeel the other as if they still know the other is a dog????

11:54, 18 June 2015 (UTC)200.42.22.13 (talk)

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DIY small-scale deacidification of books?

Is it feasible to neutralize the acid in the paper of (cheaply manufactured) paperback books, on a small scale, as a do-it-yourself project? If it is, how do you do it? --173.49.9.102 (talk) 12:29, 18 June 2015 (UTC)

1 2 Agent of the nine (talk) 15:13, 18 June 2015 (UTC)

• You might do well to contact a business like Talas that provides book preservation supplies or a bookbinder of which there are many, for example, in NYC who can advise you on the feasibility and cost of such a project. You can do the same sort of google search for Philly if that's easier, but I would call Talas first. ?????? (talk) 21:46, 20 June 2015 (UTC)

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Bearings are sticky - is this normal or has oil degraded?

I bought some of these bearings two years ago and am only ready to use one of them now. I took one from the wrapping and they're covered in something sticky. Further, the bearing rotates but it doesn't rotate freely - it feels like the sticky stuff is on the inside. Is this because the oil has degraded or are they meant to be like that? --78.148.104.139 (talk) 14:46, 18 June 2015 (UTC)

• Oh dear, this does not sound good. Tribology is a science. The manufacture probably applied the 'right' kind of grease for the application and now you have removed it. Viscosity can be important. Step-by-Step Grease Selection--Aspro (talk) 23:17, 18 June 2015 (UTC)

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People mistaking the gender of babies

Following on that dogs recognizing dogs discussion, something I've been wondering about is that some babies seem to get an inordinate number of people thinking they are of the opposite sex - despite the girls having pink dresses with butterflies on or the boys being dressed in blue and having a train type toy. It happens for all babies that some people just say he or she without thinking but for a few it is really noticeable to the extent it annoys the mothers. Any idea what could be the signs that put out this signal and override the conventions about colors? Dmcq (talk) 16:50, 18 June 2015 (UTC)

I have no idea why people have problems with this, so I've just given up and gone with Hanlon's razor. shoy (reactions) 13:50, 19 June 2015 (UTC)

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Ambulance training

Are ambulance crews trained to deal with panic attacks? I heard that much ambulance time can be wasted dealing with them as they are not life threatening. 2001:268:D003:EA32:38E8:7ECB:6307:9367 (talk) 20:53, 18 June 2015 (UTC)

Well that's fine if you know for certain that someone is suffering from a panic attack. However, if I was confronted with someone suffering from symptoms such as: shortness of breath, heart palpitations or a racing heart, chest pain or discomfort, sweating, numbness or tingling sensations etc.[10] I would call an ambulance and let the professionals decide whether they were suffering from a panic attack or a heart attack. Richerman (talk) 23:32, 18 June 2015 (UTC)

There is no way that anyone will advise a person to call anything but 911/999 if they believe it is a medical emergency. Panic and anxiety are precursors to a number of physical ailments such as cardiac arrest. It's perfectly acceptable to treat a patient as having a heart attack even if it later turns out to be a panic attack. They will be conservative since misgiagnosing a panic attack as a heart attack is inconvenient but misdiagnosing a heart attack as a panic attack is fatal. --DHeyward (talk) 00:31, 21 June 2015 (UTC)

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Ivory-bill woodpecker

Where are ivory-billed woodpeckers currently being seen? -- Preceding unsigned comment added by Kcinrawm (talk o contribs) 22:01, 18 June 2015 (UTC)

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Impact of water pressure on a scuba diver

Can someone help me understand the impact water pressure has on human scuba divers? I'm curious and have a few questions about what happens at typical scuba underwater depths.

When a diver is underwater, does the water above a scuba diver effectively push down on the diver? If so, does that pressure act to drive the diver deeper into the water? If not, why not?

I also recall hearing that water pressure can impact the lungs and lung capacity. I believe the comment implied that the lungs essentially shrink based on the water pressure. Can someone elaborate on what impact (if any) water pressure has on a divers lungs and how that occurs? Do the lungs actually shrink, or does it have more to do with the water pressure causing a diver's chest to be compressed? 68.96.8.201 (talk) 23:26, 18 June 2015 (UTC)

For just buoyancy, the neoprene suit is buoyant as well as lungs above the surface (and fat). Divers wear weights to compensate but this usually doesn't change the positive net buoyancy at the surface. At a certain level below the surface (usually around 5-10 feet in my experience), the density of air in the lungs is high enough that buoyancy changes to more neutral to slightly negative. Breathing makes the diver rise and bob at the surface. This diminishes at depth so that inhaling doesn't change the divers depth like it does near the surface. I can feel the depth where inhaling no longer rises and the tendency is to sink. Neutral buoyancy is the goal so the diver is not fighting the sink or the rise. In an emergency, there is a rapid inflation device as well as a quick release of weights but that's not a recommended ascent. Beats drowning though. --DHeyward (talk) 08:29, 19 June 2015 (UTC)

Thanks everyone for responding, thats interesting info! Nimur, I'm not sure if that link to skin diver was the intended target? Also, any suggestions on where can I learn more about the lung squishing you describe? This is all just curiosity, I'm not planning on diving myself. (OP, but on a different machine)128.229.4.2 (talk) 13:30, 19 June 2015 (UTC)

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Do window coverings have an impact on A/C usage?

I got an email at work asking employees to close the blinds on hot days - particularly when the sun is directly shining through the window - in an effort to reduce air conditioning costs. That made me wonder - does closing blinds really have a noticeable impact on an air conditioner's workload? Assuming that window coverings are just regular fabric material of a grayish color, will closing them really effectively keep more heat out of the room? Or does it just cause the window coverings themselves to absorb the sun's rays and heat up vice the entire room absorbing the sun's rays? Wouldn't the air conditioner have to do roughly equivalent work to cool down the window coverings that absorb the sun's rays as it would if the coverings were opened and the objects in the room absorbed the suns rays?

I guess my question boils down to this - does it really matter what object inside of a room gets hot by absorbing the sun's rays? Be it the window coverings, or the desk opposite the window, wont the air conditioner have to contend with either circumstance in a similar manner?

I'm sure specific conditions make a difference, but i'm just curious about any answer anyone may have in general. 68.96.8.201 (talk) 23:27, 18 June 2015 (UTC)

If the sunlight is turned into heat at the window, much of that heat will radiate right back out the window, and not enter the rest of the room. Still, I agree that white blinds are better. This is why most blinds are either white or light colored. StuRat (talk) 02:45, 19 June 2015 (UTC)

very interesting reading - thanks to everyone for their responses. (OP on a different IP) 128.229.4.2 (talk) 15:10, 19 June 2015 (UTC)

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