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    [–] how to become a farmer? JohnWilliamStrutt 2 points ago in farming

    If you are in a city full of hipsters, look into "micro"herbs. You could grow a lot in a small space hydroponically.

    [–] Watering banana trees with pig urine? JohnWilliamStrutt 3 points ago in farming

    Why in a pond rather than next to a pond? Sounds like you have a good source of urea. I would be pumping it out and spreading it on crops.

    [–] TIFU by accidentally recreating the first World War at work. JohnWilliamStrutt 6 points ago in tifu

    That article isn't quite 100% on the chemistry. Phosgene is COCl2. So Carbon, Oxygen and Chlorine. If you burn anything chlorinated you will get a lot of nasty stuff, including dioxins and phosgene. How much of each depends on the temperature, excess air, etc, etc...

    Small amounts of phosgene actually smell pleasant...

    The bottom line - don't burn anything chlorinated

    [–] TIFU by accidentally recreating the first World War at work. JohnWilliamStrutt 17 points ago in tifu

    Indeed. Thermal decomposition of brakekleen produces phosgene gas. Read this

    [–] Tools: What Companies Make Which Brands [OC] JohnWilliamStrutt 4 points ago * (lasted edited 2 months ago) in dataisbeautiful

    Have all Dolmar products been rebranded Makita yet?

    EDIT. Also you missed Echo.

    But overall great work!

    [–] Nestlé Makes Billions Bottling Water It Pays Nearly Nothing For JohnWilliamStrutt 1 points ago in news

    I didn't say they were the same value, just 2 common metric units for large quantities of water.

    [–] Nbn in Vic Park JohnWilliamStrutt 3 points ago in perth

    I switched from Amnet to iinet when NBN arrived because Amnet hadn't gotten their act together. So far so good. Best thing was getting rid of telstra...

    A mate nearby has Skykesh and is happy.

    [–] Redditors who lived abroad and moved back to your home country, what is the biggest "reverse" culture shock? JohnWilliamStrutt 2 points ago in AskReddit

    I lived in Germany for 3 years and then moved back to Australia.

    I was surprised how bad the drivers were. The people were friendlier though (especially shop assistants).

    [–] Yup, that's a 3M dust mask "air filter" sealed on with RTV JohnWilliamStrutt 2 points ago in Justrolledintotheshop

    Filtration efficiency just considers the proportion of particles of a given size (or given test dust) captured. For example an N95 respirator captures 95% of the test particles. Coincidentally at 95 lpm flow rate. That number will change a bit for different flow rates but not too much.

    What you are also talking about is pressure drop. Which is considered as well, but not as part of filtration efficiency. There is a separate term called quality factor, which is a ratio between filtration efficiency and pressure drop.

    Oiling filters helps stop rebound/reentrainment, but does not really improve capture efficiency.

    [–] Yup, that's a 3M dust mask "air filter" sealed on with RTV JohnWilliamStrutt 2 points ago in Justrolledintotheshop

    Filters in general and Air filters in particular are not sieves.

    Air filtration efficiency is inversely proportional to fibre diameter (or equivalent).

    N95 respirator filters are properly designed so they have fine fibres. Foam or aftermarket filters (e.g. those starting with K) have comparatively much larger fibre/element diameters so don't filter very well.

    [–] Yup, that's a 3M dust mask "air filter" sealed on with RTV JohnWilliamStrutt 2 points ago in Justrolledintotheshop

    That is probably better than the crappy foam things most dirt bike guys use.

    Source: am filtration engineer

    [–] pupper of darkness JohnWilliamStrutt 1 points ago * (lasted edited 3 months ago) in aww

    However this is a megabat marsupial (aka flying fox). Not a true bat It is a separate genus to northern hemisphere bats in the article linked. Flying foxes have been proven to spread the Lyssa virus, which has killed a number of horses and people.

    e.g. see here:

    People who care for rescued flying foxes need vaccinations for this reason.

    Edited to correct marsupial thing....

    [–] ELI5: According to data we have discovered 14% of all organisms on earth. Where does this number come from, if the other 86% of haven't been discovered yet (and therefore we don't know if they exist)? JohnWilliamStrutt 3 points ago * (lasted edited 3 months ago) in explainlikeimfive

    From a recent paper:

    Global species richness, whether estimated by taxon, habitat, or ecosystem, is a key biodiversity metric. Yet, despite the global importance of biodiversity and increasing threats to it (e.g., [1–4]), we are no better able to estimate global species richness now than we were six decades ago [5]. Estimates of global species richness remain highly uncertain and are often logically inconsistent [5]. They are also difficult to validate because estimation of global species richness requires extrapolation beyond the number of species known [6–13]. Given that somewhere between 3% and >96% of species on Earth may remain undiscovered [4], depending on the methods used and the taxa considered, such extrapolations, especially from small percentages of known species, are likely to be highly uncertain [13, 14]. An alternative approach is to estimate all species, the known and unknown, directly. Using expert taxonomic knowledge of the species already described and named, those already discovered but not yet described and named, and those still awaiting discovery, we estimate there to be 830,000 (95% credible limits: 550,000– 1,330,000) multi-cellular species on coral reefs worldwide, excluding fungi. Uncertainty surrounding this estimate and its components were often strongly skewed toward larger values, indicating that many more species on coral reefs is more plausible than many fewer. The uncertainties revealed here should guide future research toward achieving convergence in global species richness estimates for coral reefs and other ecosystems via adaptive learning protocols whereby such estimates can be tested and improved, and their uncertainties reduced, as new knowledge is acquired

    Current Biology Volume 25, Issue 4, 16 February 2015, Pages 500-505 Species Richness on Coral Reefs and the Pursuit of Convergent Global Estimates

    [–] [Serious] Divers of reddit, what is your most horrifying experience under water? JohnWilliamStrutt 1 points ago in AskReddit

    Getting my Abalone bag (clipped to my belt) wedged between rocks when freediving.

    Running out of air while swimming in to shore while scuba diving (still at 10 m), because i was cutting it fine with the air and then decided to grab a couple more abalone on the way in.

    [–] Where's a great place for some bbq pork buns in Perth? JohnWilliamStrutt 2 points ago in perth

    I second both Canton Bay and New moon. Also Fortune Five across the road (and up the street a bit) from New moon.

    [–] Cause of new Perth Children's Hospital lead contamination revealed JohnWilliamStrutt 1 points ago in perth

    I am all for protecting who can call themselves an engineer. However if we go for a system like QLD, you then you get silly cases like this one , where a very qualified and experienced engineer who was exonerated by a commission of inquiry, is fined, simply because their payment has lapsed.

    Most critical roles require properly qualified and certified engineers. e.g. a structural engineer cannot design a bridge or a building unless they have the appropriate national certification.

    [–] Cheap courses/certificates JohnWilliamStrutt 1 points ago in perth

    Charles Sturt uni (I think that is the uni) was setting up an engineering degree designed for people like you. Online and/or based on workplace projects.

    [–] Targa West - Cars on display in Forrest Place! JohnWilliamStrutt 1 points ago in perth

    For anyone who wants to see the classic car displays on sunday, due to wet ground, they will be moved to the north east section of the Terrace Road car park (behind the concert hall).

    [–] Postal vote relative turnout by age group (Australia) [OC] JohnWilliamStrutt 2 points ago in dataisbeautiful

    Your graph showed that these stats were from 1997, is there more recent data?

    No. This was the last time this kind of vote was held (nationally). It turned out to be a pointless waste of time.