Comment by df-fd on How big of an issue are patent trolls to the average startup? · 2020-07-16T12:36:07.727Z · score: 3 (2 votes) · LW · GW

Paul graham did one 2006

Comment by df-fd on Has LessWrong been a good early alarm bell for the pandemic? · 2020-04-05T05:48:45.803Z · score: 9 (6 votes) · LW · GW

as someone who is working in ED in Australia, I can say that Lesswrong has been consistently predict the behaviors of my hospital management by 2-3 days.

for example: I've read a lesswrong post arguing that covid-19 is serious and people should stock up while my manager was still telling us to just calm people down if asked. The stance was reversed 2-3 days later.

Slatestarcodex recommended the wide spread use of masks a whole week before my local health district recommened the same thing.

I am not certain that being slow is not part of the system design. but Lesswrong has allow me to predict future hospital policies quite consistently.

Comment by df-fd on CO2 Stripper Postmortem Thoughts · 2019-12-01T18:39:45.743Z · score: 1 (1 votes) · LW · GW

I just skimmed the article, but given that you already willing to make suck huge investment in capital and space, I just got a feeling it's easier if you just have a grow room or an algae bio-reactor running at night. the immediate benefit would be the hardware are available in consumer form and most of the design parts have been attempted.

This way the on going cost would only be marginally higher [back of envelope calculation] and you would reap other benefit beside. [food or algae oil]

Comment by df-fd on CO2 Stripper Postmortem Thoughts · 2019-12-01T03:05:37.637Z · score: 3 (2 votes) · LW · GW

yeah, I dropped the ball on that one, the grow box is out but I got a feeling a grow room is still possible but this is splitting hair.

I am wondering if I also dropped the ball on the algae claim

Comment by df-fd on CO2 Stripper Postmortem Thoughts · 2019-12-01T02:16:15.439Z · score: 1 (1 votes) · LW · GW

I vaguely remember the 4 g/L/day but on further inspection, I now realise that we can't ever reach that efficiency. If we use the 1 g/L/day but human use 1kg/day (they use less in sleep don't they?) divided by 2/3 it would be about 1.5 m3 (still quite big) and we have to account for the actual foot print which would be much higher (2x higher? 3 m3?).

I am tempted to argue that we don't have to match the CO2 production rate so perfectly since the CO2 should naturally diffuse a bit, but let's leave some margin of error on our side.

for the total volume, can't we just continuously filter out the algae to retain the optimal condition while barely increasing total volume? and since we only use it at night, the total volume need would be less. If we automatically drain it to a hidden larger tank or press it straigth to oil in the basement we maybe saving effort here but increasing volume.