Extremely cool evolution experiment where E. coli bacteria evolve to eat citrate along with many other interesting happenings.
Yes, I meant plummeting “within reason” (like x10) not plummeting to extremely low values that, as you correctly said, are not possible given the energy cost.
I am not really sure about that. There is not only a huge money cost but also a huge energy cost when sending something into orbit, would the panels even make back the fuel spent to send them? Even if the rocket hardware is reused 100% with no serious maintenance costs (reusing costs more fuel) would the panel even make back that fuel energy alone? I did not do the math but maybe not even that. If we could put them in orbit with a space elevator almost for free the tune would be way different though.
Very good point: I think the website I linked to refers to peak power, so the Kilowatthours would be lower. (not sure on this, sorry)
If the panels on orbit last double the time and produce double the energy that is only a factor of 4, while the system is about 300 times more expensive. (but again you have transmission losses that I did not consider)
SpaceX’s Falcon 9 now advertises a cost of $62 million to launch 22,800 kg to LEO, $2,720/kg. https://ttu-ir.tdl.org/bitstream/handle/2346/74082/ICES_2018_81.pdf
Given an average solar silicon price of around $9 US per kilogram in 2020 https://www.solarquotes.com.au/blog/solar-silicon-price-hike/#:~:text=Compared%20to%20the%20average%20solar,%2434%20Australian%20dollars%20per%20panel.
This would increase costs 2720 / 9 = 302 times.
The cost of a solar electric system is measured in dollars per watt. The average cost for a residential system is currently $3-5 per watt. That means the average 5-kW residential system will cost $15,000-$25,000, prior to tax credits or incentives. https://sites.energycenter.org/solar/homeowners/cost#:~:text=The%20cost%20of%20a%20solar,to%20tax%20credits%20or%20incentives.
So this system would cost about 4*302 = 1208$ per watt.
This calculation is extremely approximate, but no, it will never work, even if the cost of sending a kg to orbit plummets.
Thanks, added the comment in the correct place now.
Let’s have fun with recursion!
A checkerboard where each square is itself a checkerboard.
A cube with mirrors on both sides, the mirrors show multiple reflections of the cube.
A person wearing a shirt with an image of that person wearing that shirt.
Immune erosion is used to make people understand that immune escape is only partial and not total
Thanks for your feedback, in fact correlation is not causation and we must be very careful about self-selection effects. This is not a self-selection effect but still a correlation/causation enigma that I found interesting in recent times: high vitamin D levels were found to be heavily anticorrelated with severe COVID in observational studies, but people of old age are both sensible to severe COVID and have lower vitamin D than average, not only that but people with a healthy lifestyle of many outdoor walks also have higher vitamin D! Is this causation, correlation or both? There is a very interesting article about this on Astral Codex 10 (COVID/Vitamin D, Much More Than You Wanted To Know)
Hi, I wrote the Book-Review on Spark as my first post on LessWrong. Sadly I received no comments in response to it and I would love some feedback after spending so much time writing it. I am open to any kind of feedback about it. I really enjoyed this bounty program and I will probably partecipate also in the future ones.
It might discourage exploration and lead to more stasis in local optimums.
Half as long right?
Given the extreme infectiousness of the Delta strain it is reasonable to assume that everyone will come into contact with it (either with or without illness if the vaccine works properly). If so, if you are already 14+ days from double vaccination, the timing of coming into contact with it now or in three months time is almost irrelevant (if there is space in the hospitals, otherwise it is in fact reasonable to exercise outside a month or two).
Points 3 and 4 can only sound excessive
Where is point 4?
Yes of course
Perception of temperature is mostly cultural yes, what do you think about putting sound absorbing panels on the walls of the room?
Fascinating article, two things:
On average people prefer a room temperature of 18-22 degrees Celcius.
Are you sure? That looks really cold. My thermodynamics book said 26 C is the best temperature for confort for humans.
2. What about install sound absorbing panels on the walls for sound insulation? Sounds more confortable then earplugs and work both ways, so you can be noisy without giving trouble to the neightbours
Is this comment AI generated?