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pwrson commented on Out of Africa: celebrating 100 years of human-origins research   nature.com/articles/d4158... · Posted by u/sohkamyung
pwrson · a year ago
How do archeologists solve the survivor bias of the "Out of Africa" theory?

After all, if humans were randomly distributed on planet Earth according to the local environment's carrying capacity, 100 000 years later Id expect to find a lot more human remains in Eritrea than the Pontine marshes.

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pwrson commented on Cities can cost effectively start their own utilities   kevin.burke.dev/kevin/nor... · Posted by u/kevinburke
xienze · a year ago
Yeah it might be easy for municipal electricity to win on price when the bar is set at $0.42/kWh. Out here our evil private company is charging $0.11/kWh. I have serious doubts any municipality anywhere could deliver power for half that.
pwrson · a year ago
Cleveland Public Power rates online are <$0.10/kWh in the summer and <$0.05/kWh in the winter.
pwrson commented on The origins of 60-Hz as a power frequency (1997)   ieeexplore.ieee.org/docum... · Posted by u/theamk
freeqaz · a year ago
If we could magically pick a frequency and voltage for electrical systems to use (without sunk costs), what would it be?

What's the most efficient for modern grids and electronics?

Would it be a higher frequency (1000hz)?

I know higher voltage systems are more dangerous but make it easier to transmit more power (toaster ovens in the EU are better because of 240v). I'm curious if we would pick a different voltage too and just have better/safer outlets.

pwrson · a year ago
Probably about the same as we have.

Higher frequencies have terrible transmission (skin effect, transmission line length limit) and would start to interfere with radio.

Lower frequencies need larger transformers.

DC while nice is too expensive.

So about where we are now.

u/pwrson

KarmaCake day4February 8, 2025View Original