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Because, you know, stuff
My guess is that the diamond needle is small enough to fit in the records ditch(?), but light enough not to scratch it.
Or maybe you're just playing the wrong record[^]
I'd always thought the greater contributor to the slipperiness of PTFE was it's chemical inertness. I mean, steel is both quite reactive and quite hard, being around 80% as hard as PTFE, but a whole heap more reactive. Teflon is only about 25% harder than steel but is many times more slippery.
Don't suppose you've any idea where I can read more about the mechanism of the PTFE's slipperiness do you?
My response was supposed to be sarcastic. I'm sorry if it wasn't coming through properly.
Pure PTFE has a hardness of 60 Shore D, a bit higher with filler materials. Steel has a hardness ranging from 52 - 65 Rockwell C, where the sheet steel in a can has the lower number and a steel file is around 63 Rockwell C. A high quality chefs knife has about 58 Rockwell C.
But note that it completely different scales that doesn't even compare. 60 Shore D is approximately somewhere between a rubber tyre and nylon in hardness. Steel is many magnitudes harder.
Anyway, friction is pretty complex. There is not one reason for it and it's very many years since I studied it.
At Quora there's a discussion with many links explaining the many reasons behind friction. It's a good place to begin. What causes friction? - Quora[^].
All I wanted is to update VS2015 and get Tools for Windows 10 Universal Apps, but VS installer complained that there are pending Windows updates and I need to restart my computer. Fair enough, I'll restart it, but then Windows found new updates and start installing them. So I wait for them too.
I finally managed to update VS2015, only to be notified that I need to update it again. Ok, I'll start installer again... ...aaand there are 3GB to download and install. Well, that will take a while, better fire up Steam and waste some time while waiting for process to complete. Would you like to guess what happened next? Yes, freaking Steam started updating itself... ಠ_ಠ
Back in the day, when we had dialup instead of broadband (think 56,000 bits per second if you were lucky, children, not 40,000,000 bytes per second) a game came out called "Half Life". And the magazines (think "paper website before flash animations", children) said it was good. Nay, "brilliant" and "wonderful" were used.
So I bought it.
So I installed it from its CD.
So I ran it.
And it was Steam powered.
And Steam wanted to update itself first.
And this took 45 minutes, of which I had to pay per minute.
And the connection failed after 30 minutes.
So I swore. And I tried again. And again. And again, until I had spent more on the phone bill than I had on the game.
And I never did play "Half Life", until I bought an XBox 360, and a second hand copy. And it was good. Buggy as heck, but damn good.
And it was 10 years before I bought another Steam game... And nothing has changed, except my connection is faster and more reliable...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
Aah yes, Dial Up, before broad band, when PC's were used something other than watching videos of Pandas Sneezing... I have found a box marked Half Life (& another marked Opposing Force) I don't remember it being Steam or if it was not needing to update Steam. And Low it was good,
Supreme Court Justice Antonin Scalia found dead at Texas ranch[^]
Sad as this news may be, there is another consequence to consider: As I understand, this means that President Obama gets to appoint the next SC judge. Where the judges on the right were in a 5-4 majority, they will now be in a 4-5 minority. This may have a significant impact on rulings of the Supreme Court in the foreseeable future.
Actually, that's not quite accurate. Obama gets to *nominate* a candidate to replace him. The US Senate has to confirm the nominee to become a sitting justice.
Mitch McConnell (and a huge chorus of senior Republicans) has already said that he thinks that the Senate shouldn't confirm anyone this year until a new President is elected. Of course, that's because he knows Obama will not pick a conservative, so it's in the Republicans best interest to stonewall. Naturally, if the current President was a Republican, McConnell wouldn't waste any time at all getting the nominee confirmed.
Political bias aside, the stance that they should leave the Supreme Court without a justice for over a year is a pretty absurd proposition, and hasn't been done in a very long time. Modern politics in America at work.
If they do stonewall (which is almost certain), then that means a lot of contentious and far reaching rulings will be 4-4, effectively bringing a lot of important American law to a halt, as well as wasting HUGE amount of money since similar cases will need to work their way up to the SCOTUS again to decide on the very same issue once a justice is appointed.