MigL

At my age, running is very hard on arthritic knees.

Your heart function is a large determinant of overall health. The heart is a muscle just like every other. If you 'stress' it, it will adapt by becoming stronger and/or bigger. Unfortunately there is no way to directly exercise the heart. We can only indirectly stress it by exercising other body parts. You want to make it pump harder and more forcefully, to provide oxygen and fuel to the muscles which you can directly work. So, I would think exercising the largest muscles in your body ( thighs/glutes and possibly back ) for extended periods of time, would provide the stimulus for your heart to pump harder/faster and provide more oxygen/fuel. Typical bodybuilding methods don't really do this, as the heavy weights ( while providing incentive to that particular muscle to grow/strengthen ) don't really tax the O2/fuel delivery system. I would suggest lunges or squats to parallel ( no weight ), as many as you can possibly do ( try for 100 ) for 4-5 sets, so as to get your heart rate above 180bpm.

Just expressing my opinion, Swansont. I certainly don't make the rules and try to abide by whatever the membership/admins decide. And I'm not saying one side does it more, INow, but even the act of cancelling someone else's downvote means you are cancelling THEIR 'opinion' of a bad post, and restoring the 'reputation' of a POSTER whose ideas you respect. Clearly, that has nothing to do with the post. I also noted, that in the now closed thread, JC and I got no ( or very few ) negs, for expressing virtually the same ideas as other posters who did get neg reps. Do JC and I have more 'respect' from other members than relatively new members who did get downvoted, because we've been around longer ? If so, thank you, but I suggest that has also nothing to do with the post.

More on the general idea I'm trying to convey... The very name, REPUTATION points, refers to the poster's reputation, not to the content ( good or bad ) of the post. You are saying "You are a disreputable poster, and none of your posts have any merit" Again, how is that different from calling them an idiot ? And while I always value your opinion Zapatos, let's not continue a closed thread in this one.

So you are painting a 'scarlet letter' on the poster. DrP. Which they will 'keep' even when they make a good post. How is that different from calling them an idiot ? Edit: The rep point stays with the poster, Strange, even after that bad post is long forgotten. It is a reflection on the poster, not the post. That is how it is 'Attacking the poster, not the idea" If we are all in agreement that we allow attacking the poster, who am I to disagree ? But if we think that is not who we want to be, my opinion is we should change the rep system. ( I have never made a secret of that )

While I have no problems with positive reps, as they are essentially a 'pat on the back' for a job well done, I do have a problem with negative reps. While someone's post says may offend your sensibilities, or even be verging on hate speech, you don't have the right ( on this forum ) to attack the poster. The rule is 'attack the idea, not the poster'. Negative reps attack the poster, as they carry that negative reputation forward, they say nothing regarding the idea. You are essentially saying "you are a bad person for posting this". What's next, calling them names ? The only way around this would be to assign the negative point to that particular offending post, but not to the poster's reputation.

Just kidding Ten oz. Advanced countries don't really have wars anymore. They just take over economically. ( witness Germany's failure in two world wars, and successfully conquering Europe with the Euro/EU ) I would welcome economic take-over by the US ( i.e. more American investment ). Most of our west coast is already owned by the Chinese.

A field is simply a value associated with each point. That value can be scalar, vector or tensor. For GR the value at each point is a measure of the deviation from 'flat'. IOW the field is geometric.

As relating to the OP, Markus. Between a geometric theory and a field theory.

Invade Canada ? We kicked your ass in 1812, and we'll do it again Ten oz. And please turn off auto-correct.

Seatbelts are also only effective AFTER the 'harm has been done'. Do you dispute their usefulness ?

Oh come on, INow… Let me bask in the glory of finally starting a topic which has lasted more than a page.

GR can be interpreted as a field theory where geometry is the field. What is the distinction ? But I see the point about gravity being an apparent force ( inertial or fictitious like centrifugal or Coriolis ) , as it is only manifest in certain types of frames of reference.

Well don't keep us in suspense. What is this multinational company you've invested in ? ( mine is in my profile )

On a somewhat related note, some charges against H Weinstein in New York state, brought by L Evans, have been dropped. Not because he is innocent ( or guilty ) of them, but because of mishandling/coaching of the accuser's statement/testimony. ( thank goodness there are quite a few accusers/charges, otherwise Harvey might get a Supreme Court appointment too )

If I was a mailman in that area I'd be asking for danger pay. Shouldn't matter where the jury comes from, or where the trial is held. This kind of behaviour should offend/disgust anyone.

Differing definitions BeeCee... In relativity there is no background stage on which events take place. Space-time is simply a co-ordinate system, and, as such, it can be an empty co-ordinate system. Quantum field theory does make use of a background stage, which is by definition, filled with fields. So an empty space-time is meaningless in QFT.

And significant effects ( non-trivial ) of the kind you are speculating about,would involve serious ( definitely non-lab based ) amounts of mass-energy. You could probably achieve those effects with ( many ) orders of magnitude less energy using methods other than frame dragging.

I also got differing definitions of derivatives in high school and university. But, being in Physics, and not needing that stubborn trait of Mathematicians to define, and re-define everything, I simply use them as a tool. ( I don't define a hammer when I bang in a nail )

Take Ten oz's advice... Save a little more, enough for a down payment, invest in real estate. Re-invest the gains in value. Make your money work for you. You won't become filthy rich, but you'll be more than comfortable. In the early 80s, I had about $25000 saved. Older war-time homes ( built in the 40s ) were selling for about $25-35000. But interest rates were as high as 16-18%, which made investment kind of scary for a person in their early 20s without a good job. Three years later, after the recession, these same homes were selling for $75-90000. Had I taken the risk and invested $5000 ( down payment ) on five such homes, and rented them out, I could have increased my 'wealth' by more than an order of magnitude. To this day, I still kick myself for not taking the risk.

A civil war will not happen again in the US. I have faith in my American brothers; They can be led astray, but they'll come to their senses eventually. Civil wars are usually about the simplest reason, money and wealth. The American Civil War was not about slavery, it was about a system that allowed the accumulation/retention of wealth in the South. I see the next civil war in China. The most billionaires of any nation, and over a billion people living on $5 per day. Eventually those billion people are gonna demand their share of the pie.

Not necessarily a SATA cable attached to the mainboard. You can get SATA to USB cables which will attach the hard dive to your USB port, saving the trouble of having to re-open your case ( or if you're using a laptop )

Just reload windows. If the computer hasn't run since Win10 came out, it'll be doing a load of updates anyway. You can reload Win10 with the option of saving your files, or if you don't need them, a fresh installation.

It isn't done because, as you rightly say, Ten oz, politicians are looking out for their careers, not the country. Can you imagine how long a politician's career would last in the US, if they proposed gun legislation, or pot for that matter ? They take the easy road and have unaccountable, appointed-for-life judges make the hard choices, that often disagree with the people's wishes, and then claim its out of their hands.

The hearings were a sham; where politicians give the appearance of doing something without actually doing anything, and proceed to do what they would have done all along. B Kavanough was never in any danger of losing the appointment, no matter what games the Republicans ( and Democrats ) played. That's the sad state of American partisan politics. That being said ( and I have on numerous occasions ), I find C Blasey Ford more likeable, believable and sympathetic than B Kavanough, who gives the impression of being a spoiled, arrogant man-child. But these are just personal OPINIONS. I would never base guilt or innocence on personal opinion. Even the fact that he may have lied about some things ( possible depending on your definition of lying; C B F is allowed not remembering, why isn't B K ? ) does not mean he committed or attempted rape. The only way we'll get to the bottom of this mess is if criminal charges are filed. Then at least we will possibly know. But B Kavanough will unfortunately still be a Supreme Court Justice.