<div dir="ltr">I love Fermi's problems, they are very important to understanding the world around us, orders of magnitude questions can give us important insights about the universe.<br><br>Talking about orders of magnitude and scaling properties my Power Law Model for BTC is getting some attention. If you want to watch this great interview I did with finance YouTube celebrity Andrei Jikh and send me a like I would appreciate it. Let me know what you think. <br><br><a href="https://www.youtube.com/watch?v=UX8LPbMGyl4&t=196s">https://www.youtube.com/watch?v=UX8LPbMGyl4&t=196s</a><br><br>Thanks,<br>Giovanni <br><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 6, 2024 at 5:19 AM spike jones via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
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-----Original Message-----<br>
From: <a href="mailto:spike@rainier66.com" target="_blank">spike@rainier66.com</a> <<a href="mailto:spike@rainier66.com" target="_blank">spike@rainier66.com</a>> <br>
...<br>
<br>
>...Consequently... plenty of people come to the USA and choose homeless<br>
here rather than homeful wherever they come from. If one is going to live<br>
outdoors, an overpass or under a bridge makes perfect sense...The masses<br>
want freedom and capitalism, even if it means they must camp out here to get<br>
there. spike<br>
<br>
<br>
I have been all over the map on this one, so I decided to post something<br>
over on a yet-uncommented part of the thought-map.<br>
<br>
The high schools play a game named for Enrico Fermi who was really good at<br>
this: estimating the order of magnitude. An example of a fermi question<br>
would be: How many neutrons are in a fig newton?<br>
<br>
A good player would estimate its mass at about 10 to 20 grams, mostly<br>
carbon, a mole of carbon is about 12 grams, so about a mole times six<br>
neutrons per carbon atom, so 3.6E24 neutrons approximately, and depending on<br>
how you estimate mass, the answer might be either 24 or 25.<br>
<br>
Local flooding: there is a footbridge across the local waterway. I was over<br>
there during last year's rains and noticed that the water is the color of<br>
chocolate milk. I found a cup and scooped out a water sample, let it settle<br>
and observed that you aren't far off if you estimate the water is 10%<br>
sediment by mass, perhaps 5% by volume. There really is that much silt and<br>
soil washing down that channel.<br>
<br>
I was over there yesterday and estimated, Fermi style, the average depth<br>
across there, about a meter, and its width, about ten meters. When the<br>
water is that color, as it is now, the flow rate is likely higher than a<br>
meter a second, but a meter per second as a Fermi-ey estimate will get you<br>
there. So... after a hard rain, as we have been having all week, about ten<br>
cubic meters per second flow rate down that channel, at about 10% silt.<br>
<br>
Fermi question: in kg, the mass of silt carried by the Penitentia Creek<br>
after a hard rain per second. Answer: 3. 10^3 kg per second. A ton of<br>
silt per second. This process can go on for hours, or days.<br>
<br>
Second question: where does all that silt go? <br>
<br>
It gives one a new sense of how deltas form, and what happens when we need<br>
the space to build homes, so we defeat nature's course and build a single<br>
narrow channel where a vast river delta used to be. <br>
<br>
Prediction: eventually that channel will silt up and restrict flow rate,<br>
causing water to rise along the course of that river. Consequence: the<br>
homeless living under those bridges will get washed out more regularly.<br>
<br>
spike<br>
<br>
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