MigL

Ooops! My apologies. I did not realize you meant the difference in relation to the pictures.

Mass is, equivalent to weight, by definition, on the Earth's surface ( 1 g ). Weight is the force experienced by that mass due to Gravity. So, while equivalent on the Earth's surface ( 1 g ), your mass on the Moon remains unchanged, but your weight is approx. 1/6 of that on Earth, due to the moon's Gravity being approx. 1/6 that of the Earth.

I find it amazing that so many people have no issues whatsoever with Galilean Relativity, where no experiment carried out in an inertial frame can determine if you are moving, then when Einstein uses this principle in his thought experiment of riding on a beam of light, holding a mirror in front of his face, and being required to see his reflection, meaning that the speed of light is strictly observer dependent ( and all that implies ), all of a sudden, it's an issue. The laws of Physics have to be self-consistent.

That does seem to be a reason why a lot of people are put off helping others. And I realize its only anecdotal, but everyone has seen a young man, un his early 30s, pan handling, where I retired at 67 ( and would still be working if I could see to drive to work ); just the other day, I still gave him my loose change, but I know there are jobs available. Also anecdotal, I have gone into a grocery store and used up all the cash I had with me, when a young girl asks for change. I apologize, having no cash left, and ask her to take whatever she wants from my grocery bags. She tells me to "Go f**k myself". These kinds of behaviors sour people on helping others, even though it is only one observation from which you shouldn't draw generalizations. The 'American Dream' of becoming wealthy is no longer available; you need to be a crook, and corrupt, to become wealthy, as exemplified by a President who is their role model. But the 'American Dream' compared to most of the rest of the world, is still a thing. I have never been able to figure out what so many Americans are complaining about, or why they are so angry at immigrants and foreigners. They don't seem to realize how good they have it. If only they could keep the Billionaires from turning the other 90 % of the population to servitude ( or spending 1.5 Trillion on DoW ), there would be plenty of wealth to go around and even help the rest of the world.

Mass is an emergent property of leptons, quarks and W/Z bosons that arises from an interaction ( Higgs mechanism ) where the original interactors are no longer available. If Gravity was part of the original GUT SuperForce ( ToE ), it would have similarly emerged through a previous symmetry break, albeit a different emergence than the one suspected by @Markus Hanke . This seems very different ( to me ) from the statistical emergence of Thermodynamics or the 'ganged' behavior of harmonic oscillators. Whether you choose to call the difference reversible vs irreversible, or weak vs strong emergence, the difference is evident. Our very definition of 'emergence' needs clarification. I mean, statistical, grouped or ganged, behavior does lead to differing properties of the system because of non-linear or chaotic factors, but we can also investigate the behavior of the individual components of that system, by simply changing scales, to gain some idea of how they contribute to the system's behavior.

I would venture there are differing types of 'emergence'. The one type that immediately comes to mind is Thermodynamics and fluid flow emerging from particle statistics, which is essentially observer scale dependence. The 'genie' is never let out of the bottle, we are just investigating a different scale, so no need to put the 'genie' back in. I can also envisage an emergent property that arises from interactions of some other properties, such that the original interacting properties are no longer available for investigation, and this, irreversible. I can't think of one such emergence off the top of my head, and I don't currently have time to research one, as I have to attend the wedding of the son of a deceased close friend, but this seems like an interesting topic, so I had to quickly post.

Human nature. If you consider the situation in our own particular countries, the situation applies to 'a small number who fail to manage themselves regardless', as we live in fairly affluent societies. Our ancestors, if they wanted to live apart from their tribe, and do whatever they wanted, ran the risk of being killed by a pack of wolves, or freezing outside of the cave. It is a modern notion that we should be able to do whatever we want, while still being afforded society's protection; sometimes actually demanding it. If shelters and food are available, should you be forced to accept it, or sleep outside in freezing weather ? There is also the situation, mostly do to wealth inequality, where a percentage of the population, in our countries, does not see the benefit of our economies, as most of the profits go to obscenely rich individuals or large corporations. This is not as much a moral issue like the previous, but has some systemic element. If we tax rich people and corporations much higher and they go 'off-shore', are we prepared to have more social services, but less jobs ? This same issue is also evident on a global scale, where our desire for cheap goods, causes corporations to move production to countries where they can take advantage of cheap labor, and steal their resources. So while we provide to their economies in the form of employment, a lot of the profits are funneled back to the large corporations' shareholders. Are we providing employment opportunities, or simply taking advantage of cheap, sometimes child, labor ? There are also the cases of impoverished countries where we used to send 'aid' ( yes, I'm looking at you America ), but their rulers use that 'aid' to fund weapon purchases, to control their population, and keep them ignorant. If we cut off aid maybe the people rise up and overthrow their dictators, but millions die; is it worth it ? These, and others I haven't mentioned, are all different issues, and are getting worse, not better. they require differing mitigation approaches, but because of human nature, these issues will never be eradicated; they don't even seem to be improving.

Apparently Europe has hit a milestone in the month of June. It is reported that Europe got 25 % of its energy from solar in the month; an increase from 10 % five years ago. Mind you, the situation is not as rosy in the winter, because A/C is not a big energy load in European summers. Mean while the US is attacking Iran ... again, in an effort to re-open the Strait of Hormuz, and get oil flowing again to save its reserves. How is that for clear-headed planning. I like this girl. Born in the Vatican, spoke Latin as a little girl, and PhD in Computer Science. Her analysis provides my daily vent against all things Trump/MAGA/Republican.

The game is fine if played by the rules, refs aren't biased, FIFA doesn't play favorites, Presidents/Governments don't get involved, and people don't try to change it. It has become the most popular game in the World for a reason.

First time I ever ran across a copy of it, I was maybe 5-6 years old, and it was in a foreign language that I assumed was Latin, but it may have been Greek. I was already familiar with the Iliad, the Odyssey and Aeneid, courtesy of a classical Italian education system ( those were our 'fairy' tales ). I later watched a serialized black/white version on Italian TV ( about 1967 ), and to this day, I vividly recall the Cyclops ( Polyphemus ) eating Ulysses' men, blinding him after he was drunk, sneaking out under the bellies of the sheep, and the trickery with the 'nessuno' name ( Italian for 'nobody' ). Being 7-8 years old, I couldn't sleep for weeks.

I wouldn't go that far. It just happens that the best model we have for gravity is geometric. If you look up Kaluza-Klein Theory you will find that it utilizes a hidden/curled up 5th dimension to merge Einstein's GR with Electromagnetism into a consistent, but classical, geometric theory. ( electric charge is the 5-velocity component along the 5th dimension ) First proposed by T Kaluza in1919, then refined, with Einstein's approval, by O Klein in 1926. See here for a clearer explanation Kaluza–Klein theory - Wikipedia This was, of course, before the advent of QM ( which introduced difficulties with the predicted mass of the electron ) and before the weak and strong/color forces were known about ( a geometric treatment of those forces would have proved unwieldly, if at all possible ).

Yeah, England did play some of the most exciting games, against France , Mexico and even the Congo game. Argentina turned out to be real sore losers ( other than L Messi ) even though they were thoroughly outplayed by Spain. 90 min without a single attempt/shot on goal ) I do think FIFA and the officiating were making 'excuses' for them throughout the tournament, and after their boorish display after the final, there was a 23M signature petition to ban them from FIFA, as of yesterday. ( they can always play with Russia )

JD is always getting blamed for something or other ... ( so I switched to double oaked Woodford Reserve ) And now I can't get either since our Government is boycotting American booze.

Thanks again Markus. You certainly have a way explaining at an understandable level. ( you should have gone into teaching )

Oh wow! I discuss science with a bunch of Betty Crockers and Star Trek nerds 🙂 😀 .