My wife gets a new iPhone every two years when her contract is up. From day one she is carrying a charger around with her and plugs the phone in every time she gets into a car. Is it just her or does everyone with an iPhone carry a backup battery or charger around? Why do people keep buying this stuff?
for a free or discounted product. I think about half of my reviews are negative or neutral, and I avoid doing reviews on things like vitamins that will produce nothing but expensive urine.
Second lesson: don't believe everything you read posted by anonymous cowards...
Metal vacuum tubes have a glass vacuum tube enclosed by a metal cover. The tube itself is not metal. Glass vacuum tubes are connected to vacuum pumps and sealed off. The getter is there to pick up "stuff" that boils off the filament and out of the other metal parts in the tube, it does not create the vacuum.
Electrostatic speakers/phones aren't especially hard to make, but sourcing the materials can be difficult. You need ultra thin polyester film for the diaphragms, and some sort of weakly conductive coating (Licron or similar antistatic spray works well). You also need a method of stretching the diaphragm film tight and then gluing it while stretched. I invented a pneumatic stretcher almost 30 years ago when I was into all this stuff. 4693H contact adhesive will stick to the polyester (not much else will)...
When vacuuming hard floors you don't want a carpet beater brush spinning- the vacuum will suck the dirt into the brush which will then fling it all over the floor instead of depositing it into the maw of the machine.
My point about "refurbs" was that maybe they aren't really refurbs. Maybe they're a second pricing tier for new vacuums to be sold to the "poor" and cheapskates. Refurbs come with reduced warranty and probably less fancy packaging that makes for a "cheaper" user experience. If they sold as new the people who paid full retail would get pissed off and stop buying them for the premium price.
I was recently shopping for a vacuum to replace a couple "brand name", upright, bagless machines acquired over the years from Walmart or similar vendors. My two main reasons for replacement were the bagless systems were very dirty- emptying them involved holding it at arm's length over a trash can, taking a deep breath, opening the trap door and dropping the dirt into the trash in a cloud of dust. The other main complaint was the noise. Jeez, those things were awful. I couldn't stand to be in the house when one of them was running. The upright design requires moving the weight of the whole machine while vacuuming- very tiring.
Given the Dyson's reputation for being a premium product, I checked into them. Bagless- ugh! And on-line reviews by both pros and consumers said they were noisy as all get-out. And then there were all those refurbs...
I eventually settled on a Miele C4. It's very quiet, cannister type (much easier to use because you don't have to keep moving the weight of an upright back and forth), uses bags that close themselves up when you take them out of the machine. The air rushing through the nozzles makes more noise than the motor unit. My cats will sit undisturbed while I vacuum until the nozzle is within 1 m of them, then they just move out of the way.
I've been doing a lot more vacuuming since I got the Miele. It is hard to believe it can move as much air as it does an be so quiet.
Observation: it seems there are more places to buy refurbed Dyson vacuum cleaners and fans than there are places to buy them new. To me that suggests that they have terrible manufacturing and/or design quality, or that Dyson's marketing people have decided to charge a high price to the biters who are willing to buy a "new" Dyson vacuum cleaner or fan, and then sell "refurbs" to the unwashed masses who can't or won't buy a "new" unit.
Whatever is going on, the availability of all those refurbs has left me with an impression of poor quality. No thanks.
Yes, some dentists have given up trying to convince people of the safety and advantages of amalgam fillings and do great business taking advantage of the fear mongering that is so common on the internet these days. Some guys even go as far as wearing hazmat suits while they take out amalgam fillings. https://www.sciencebasedmedici... It's great theater! If they just took out all the silver fillings and replaced them, you might never mention it to your friends, but if they wear hazmat suits and respirators while they do it, it's all but guaranteed that you're going to tell everyone you know about it. That will get a few of your more easily influenced friends to start wondering, and pretty soon they are calling up your dentist.
If your filling fell out, it either broke (less likely) or you developed decay under it (more likely), or the tooth fractured (possible) or a combo of those (also possible).
Amalgam fillings work by sealing the tooth very tightly. They are held in mechanically, by the shape of the filling and the tooth. Amalgam is extremely strong in compression (as in when chewing food) and routinely last for decades (I have some that have been in my mouth >40 years). As amalgam fillings age, the surface corrodes a bit, and actually seals tighter than when it was initially placed. Contrary to popular mythology, they do not spontaneously decompose and release mercury any more than the coins in your pocket spontaneously decompose. If they did that they would get smaller and looser over time, but they don't.
Composite fillings (the tooth colored ones) bond to the tooth chemically and shrink as they harden, putting stress on the bond with the tooth. After thousands of thermal cycles (eating hot and cold food/drink) and mechanical cycling from chewing, the bond with the tooth fails and the filling "leaks". You get decay under the filling unless a dentist spots the failed bond and repairs it. Composite fillings typically have to be replaced in 5-10 years depending on the shape of the filling and which tooth it is in.
If you don't floss, food trapped between the teeth supports growth of bacteria that can cause tooth decay. The bacteria feed on sugars in the food and produce acids that erode the enamel. As the bacteria grow in numbers they produce biofilms that protect them from chemical action. As the enamel erodes, it becomes porous and provides a very sturdy structure in which the bacteria may reside and continue their destruction of your teeth. The biofilm also mineralizes and becomes very hard, yet porous. Once the enamel has been penetrated, you have a cavity that should be repaired by a dentist. The dentin under the enamel is much softer than the enamel and decay spreads rapidly inside the tooth.
Flossing prevents cavities by mechanically removing the trapped food and the biofilm that the bacteria produce to protect themselves. Flossing doesn't go more than 1-2 mm below the gum line, depending on the bone structure, technique, etc. Flossing won't reverse periodontal pocketing. That's what you go to a dental hygienist or a periodontist for.
Yes, the gap size matters. If the space between the teeth is sufficiently large, food is ullikely to get trapped and a tooth brush will clean between the teeth adequately. Most adults don't have that much space between the teeth. My patients who have large spacing between some teeth don't usually develop cavities in the wide spaces.
When you bite down on food, the ligaments that hold the teeth in the sockets compress allowing the teeth to move slightly. That movement opens the space between the teeth and allows food to get trapped. That compression of the periodontal ligament affects proprioceptors that provide the sensation of pressure when you bite down so that you don't bite too hard and damage the tooth/ligament.
In your case, once a week may be sufficient, but it is a function of diet, self care habits, and some biochemistry. Since it is impossible to tell who needs to floss daily and who can get away with once per week, we prefer to err on the side of safety and recommend daily flossing for all patients.
Slashdot Mirror
"20GB of unlimited data". What does that mean? Is it 20GB or is it unlimited?
I think they have Trump writing their ad copy...
by spraying vinegar in their general direction?
My wife gets a new iPhone every two years when her contract is up. From day one she is carrying a charger around with her and plugs the phone in every time she gets into a car. Is it just her or does everyone with an iPhone carry a backup battery or charger around? Why do people keep buying this stuff?
for a free or discounted product. I think about half of my reviews are negative or neutral, and I avoid doing reviews on things like vitamins that will produce nothing but expensive urine.
Second lesson: don't believe everything you read posted by anonymous cowards...
Metal vacuum tubes have a glass vacuum tube enclosed by a metal cover. The tube itself is not metal. Glass vacuum tubes are connected to vacuum pumps and sealed off. The getter is there to pick up "stuff" that boils off the filament and out of the other metal parts in the tube, it does not create the vacuum.
Electrostatic speakers/phones aren't especially hard to make, but sourcing the materials can be difficult. You need ultra thin polyester film for the diaphragms, and some sort of weakly conductive coating (Licron or similar antistatic spray works well). You also need a method of stretching the diaphragm film tight and then gluing it while stretched. I invented a pneumatic stretcher almost 30 years ago when I was into all this stuff. 4693H contact adhesive will stick to the polyester (not much else will)...
Have at it: http://mark.rehorst.com/ESLs/i...
You do realize that you paid for it- credit card companies are not in the habit of giving things away.
When vacuuming hard floors you don't want a carpet beater brush spinning- the vacuum will suck the dirt into the brush which will then fling it all over the floor instead of depositing it into the maw of the machine.
How's the noise level? Reviews I've seen of Dyson vacuums say they are as noisy as the cheapo Dirt Devils, and similar budget machines.
My point about "refurbs" was that maybe they aren't really refurbs. Maybe they're a second pricing tier for new vacuums to be sold to the "poor" and cheapskates. Refurbs come with reduced warranty and probably less fancy packaging that makes for a "cheaper" user experience. If they sold as new the people who paid full retail would get pissed off and stop buying them for the premium price.
I was recently shopping for a vacuum to replace a couple "brand name", upright, bagless machines acquired over the years from Walmart or similar vendors. My two main reasons for replacement were the bagless systems were very dirty- emptying them involved holding it at arm's length over a trash can, taking a deep breath, opening the trap door and dropping the dirt into the trash in a cloud of dust. The other main complaint was the noise. Jeez, those things were awful. I couldn't stand to be in the house when one of them was running. The upright design requires moving the weight of the whole machine while vacuuming- very tiring.
Given the Dyson's reputation for being a premium product, I checked into them. Bagless- ugh! And on-line reviews by both pros and consumers said they were noisy as all get-out. And then there were all those refurbs...
I eventually settled on a Miele C4. It's very quiet, cannister type (much easier to use because you don't have to keep moving the weight of an upright back and forth), uses bags that close themselves up when you take them out of the machine. The air rushing through the nozzles makes more noise than the motor unit. My cats will sit undisturbed while I vacuum until the nozzle is within 1 m of them, then they just move out of the way.
I've been doing a lot more vacuuming since I got the Miele. It is hard to believe it can move as much air as it does an be so quiet.
Observation: it seems there are more places to buy refurbed Dyson vacuum cleaners and fans than there are places to buy them new. To me that suggests that they have terrible manufacturing and/or design quality, or that Dyson's marketing people have decided to charge a high price to the biters who are willing to buy a "new" Dyson vacuum cleaner or fan, and then sell "refurbs" to the unwashed masses who can't or won't buy a "new" unit.
Whatever is going on, the availability of all those refurbs has left me with an impression of poor quality. No thanks.
That depends on what the precise definition of "is" is.
It makes them narrower (mesial-distal) because the grit gets between the teeth and causes the most wear.where the pressure is greatest.
Yes, some dentists have given up trying to convince people of the safety and advantages of amalgam fillings and do great business taking advantage of the fear mongering that is so common on the internet these days. Some guys even go as far as wearing hazmat suits while they take out amalgam fillings.
https://www.sciencebasedmedici...
It's great theater! If they just took out all the silver fillings and replaced them, you might never mention it to your friends, but if they wear hazmat suits and respirators while they do it, it's all but guaranteed that you're going to tell everyone you know about it. That will get a few of your more easily influenced friends to start wondering, and pretty soon they are calling up your dentist.
If your filling fell out, it either broke (less likely) or you developed decay under it (more likely), or the tooth fractured (possible) or a combo of those (also possible).
Look for teflon floss, brand name "Glide" or other.
If you honestly think that bacteria can't move from one place to another in your mouth without your help, you don't know anything about bacteria.
Waxed or unwaxed? This will really bake your noodle: teflon!
Amalgam fillings work by sealing the tooth very tightly. They are held in mechanically, by the shape of the filling and the tooth. Amalgam is extremely strong in compression (as in when chewing food) and routinely last for decades (I have some that have been in my mouth >40 years). As amalgam fillings age, the surface corrodes a bit, and actually seals tighter than when it was initially placed. Contrary to popular mythology, they do not spontaneously decompose and release mercury any more than the coins in your pocket spontaneously decompose. If they did that they would get smaller and looser over time, but they don't.
Composite fillings (the tooth colored ones) bond to the tooth chemically and shrink as they harden, putting stress on the bond with the tooth. After thousands of thermal cycles (eating hot and cold food/drink) and mechanical cycling from chewing, the bond with the tooth fails and the filling "leaks". You get decay under the filling unless a dentist spots the failed bond and repairs it. Composite fillings typically have to be replaced in 5-10 years depending on the shape of the filling and which tooth it is in.
I doubt a human study like that would get past the ethics committees who review such proposals.
They're great where you can get them to fit. If you can't fit them between the teeth they can't help you. Floss fits everywhere.
I am a dentist, too. I often see hypoplastic enamel on first permanent molars in kids. It's pretty common. Otherwise, I agree completely.
If you don't floss, food trapped between the teeth supports growth of bacteria that can cause tooth decay. The bacteria feed on sugars in the food and produce acids that erode the enamel. As the bacteria grow in numbers they produce biofilms that protect them from chemical action. As the enamel erodes, it becomes porous and provides a very sturdy structure in which the bacteria may reside and continue their destruction of your teeth. The biofilm also mineralizes and becomes very hard, yet porous. Once the enamel has been penetrated, you have a cavity that should be repaired by a dentist. The dentin under the enamel is much softer than the enamel and decay spreads rapidly inside the tooth.
Flossing prevents cavities by mechanically removing the trapped food and the biofilm that the bacteria produce to protect themselves. Flossing doesn't go more than 1-2 mm below the gum line, depending on the bone structure, technique, etc. Flossing won't reverse periodontal pocketing. That's what you go to a dental hygienist or a periodontist for.
Yes, the gap size matters. If the space between the teeth is sufficiently large, food is ullikely to get trapped and a tooth brush will clean between the teeth adequately. Most adults don't have that much space between the teeth. My patients who have large spacing between some teeth don't usually develop cavities in the wide spaces.
When you bite down on food, the ligaments that hold the teeth in the sockets compress allowing the teeth to move slightly. That movement opens the space between the teeth and allows food to get trapped. That compression of the periodontal ligament affects proprioceptors that provide the sensation of pressure when you bite down so that you don't bite too hard and damage the tooth/ligament.
In your case, once a week may be sufficient, but it is a function of diet, self care habits, and some biochemistry. Since it is impossible to tell who needs to floss daily and who can get away with once per week, we prefer to err on the side of safety and recommend daily flossing for all patients.