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Comment Re:Air Conditioners save lives (Score 2) 116

There is a strange movement in Europe against Air Conditioners.

Yes. But a large part of that is the difficulty in retrofitting it to their older buildings. In the USA, we have a large installed base of forced air heating. Which can be upgraded to a heat pump. Also, we (USA) have more stand alone single family dwellings. So remodeling or even piping in split systems is easier. And with a heat pump, you not only get more efficient heat, but A/C as well.

hate and refuse to promote air conditioners often use refrigerators and freezers in the same homes.

Completely different applications. Refrigerators/freezers are self contained and much smaller than an entire house. And they prevent food spoilage. A much more serious problem than hot weather.

Comment Re:They are getting older (Score 2) 16

But large black holes also have extreme gravity

But do they really? They have greater mass. But the Schwarzschild radius is (sort of) defined by that distance from an object's center where the escape velocity is equal to the speed of light. And that is what we think about when we say "gravity". So this value should be the same at the "surface" of every black hole.

If this is the case, then the effects occuring near this surface would be the same for all black holes, given an identical height above it. And given that, we would have trouble picking apart a redshift due to extreme distance (Hubble) from that caused by events close to that surface (gravitational red shift).

So if we can't really tell how far away it is, we can't reliably estimate its energy level.

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