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Comment Re:projecting UV images from below liquid resin? (Score 1) 95

Thank you. I just couldn't understand it; although clearly the clues were there and you interpreted them correctly.

So the UV light goes through the bottom window, through the oxygen-rich zone that will not polymerize. When the light gets through that zone, it polymerizes the resin. The polymerized resin must block the light from going deeper into the liquid resin.

If you have a thick part, though, I wonder if this could work? New unpolymerized resin would have to flow into the gap between the hardened part and the window, and this 'dead zone' is only microns thick. Now, I do believe that most 3D printed parts aren't solid blocks; but this could be a limitation.

Still, looks quite cool. I am sure that I'm not alone wanting to build stuff with it!

Comment How can this work? Even with 4000 satellites? (Score 2) 115

The area of the earth is 4,000^2xpi square miles, so even with 4,000 satellites there is one for every 12,000 square miles. OK, perhaps the very high latitudes don't need to be covered, and you can get that down to 10,000 square miles. For the United States, the average population density means that on average, you'd have 500,000 people covered by one satellite. Europe, Japan, China, Indonesia, and many other countries or regions have significantly higher population density. For cities, this is just a non-starter.

Now, Musk is not a stupid guy, but I just can't see how this works.

Comment Re:As an Engineer/Journeyman Machinist I can tell (Score 1) 188

Or.........
as a computer scientist you could look into the field of evolutionary algorithms, discover that evolution is an applied science used by half of Fortune 500 companies, discover how evolution does work, and write your own code and witness first hand that evolution works.

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Comment Re: Salem Hypothis: Be careful not to paint with (Score 1) 188

Let's say 30% of the population are creationists.
Let's say 10% of Engineers are creationists, because creationists are less likely to pursue the field and/or because their education convinced them to no longer be creationists.
Let's say 1% of scientists are creationists, because creationists are less likely to pursue the field and/or because their education convinced them to no longer be creationists.

Result: Any creationist claiming to have a "science degree" has something like a 90% chance of turning out to have an engineering degree.... even though engineers are unlikely to be creationists.

That's the Salem Hypothesis. Creationists claiming science degrees tend to be engineers, even though engineers tend not to be creationists.

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