• What fact check site do conservatives trust?

    I'm not trolling here. I know that they don't like Snopes because, well the Mikkelsons are from California, so they'er obviously liberals. So, if Snopes is unacceptable and I want to let one of my conservative friends know that no one is putting HIV infected needles in gas pump handles, that it's an old scare going back to when... show more
    I'm not trolling here. I know that they don't like Snopes because, well the Mikkelsons are from California, so they'er obviously liberals. So, if Snopes is unacceptable and I want to let one of my conservative friends know that no one is putting HIV infected needles in gas pump handles, that it's an old scare going back to when there were pay phones and people supposedly put HIV infected needles in the coin returns, who can I send them to that they will actually trust the source.
    21 answers · Politics · 1 week ago
  • What famous (possibly infamous) Chicogoan?

    died in the summer of 1957 - 59 or maybe 1960. The person died someplace else and was returned to Chicago for services. Whoever it was, had enough significance that it warranted a police escort, and people lined the road taking pictures of the hearse as it left the airport
    died in the summer of 1957 - 59 or maybe 1960. The person died someplace else and was returned to Chicago for services. Whoever it was, had enough significance that it warranted a police escort, and people lined the road taking pictures of the hearse as it left the airport
    3 answers · History · 3 weeks ago
  • Hydrogen alpha imaging with a high megapixel color sensor vs a dedicated monochrome camera?

    I have a Sony Alpha7R Mk2 DSLR which produces 42 Mpix images. Given that only one in 4 pixels is going to see anything in a Ha image, that cuts my resolution by a factor of 4 resulting in effectively a 10 Mpix image. The highest resolution I see on the monochrome cameras is about 5 Mpix. Am I better off using 1/4 of the pixels of a Bayer filtered... show more
    I have a Sony Alpha7R Mk2 DSLR which produces 42 Mpix images. Given that only one in 4 pixels is going to see anything in a Ha image, that cuts my resolution by a factor of 4 resulting in effectively a 10 Mpix image. The highest resolution I see on the monochrome cameras is about 5 Mpix. Am I better off using 1/4 of the pixels of a Bayer filtered sensor that has 42 Mpix or does a lower pixel count monochrome camera still have other advantages?
    1 answer · Astronomy & Space · 7 months ago
  • Comments on this telescope please?

    I am interested in getting an entry level telescope with the primary goals of lunar and planetary viewing (as opposed to deep space objects). I have a good bit of experience with photography and microscopy. The Celestron Advanced VX 8" EdgeHD appears to be about the level that I am looking for with a decent, but not huge aperture, Go To system,... show more
    I am interested in getting an entry level telescope with the primary goals of lunar and planetary viewing (as opposed to deep space objects). I have a good bit of experience with photography and microscopy. The Celestron Advanced VX 8" EdgeHD appears to be about the level that I am looking for with a decent, but not huge aperture, Go To system, and reasonable portability. I have both Nikon and Sony full frame cameras for image capture. Would you recommend a different scope (somewhere near this price point)? What accessories do you consider indispensible? I plan to use the scope to observe the eclipse. Aside from the necessary neutral density filter and suitable eye protection for myself, is there anything else I would need?
    5 answers · Astronomy & Space · 7 months ago
  • Telescope for general viewing plus solar?

    For many years I have been interested in astronomy, but made a decision a good while back to go the direction of microscopy rather than getting a telescope. With the upcoming total eclipse, I have a new impetus to my astronomy urges. But I don't want to buy a dedicated solar scope, at least I don't think so. After the eclipse, I would like... show more
    For many years I have been interested in astronomy, but made a decision a good while back to go the direction of microscopy rather than getting a telescope. With the upcoming total eclipse, I have a new impetus to my astronomy urges. But I don't want to buy a dedicated solar scope, at least I don't think so. After the eclipse, I would like to use the scope for more traditional stuff - moon, planets, nebulae... I am at the point in life where I can afford some decent optics. A four figure price tag isn't too much, though I need to question how much I'll really be using it if we start talking 5 figures. What sort of system should I be looking at? Am I seriously hobbling my eclipse viewing by relying on add-on filters for a traditional scope? Is an internal doppler etalon essential for a good hydrogen alpha image (this feature seems to be emphasized in the dedicated solar scopes)? What add-on filters would be most useful for the eclipse? It's probably another discussion altogether, but do you have any recommendations for automated trackers to accommodate for Earth rotation?
    3 answers · Astronomy & Space · 7 months ago
  • Firing a howitzer?

    I have an old picture of my father's artillery unit. One shows a soldier about to fire the weapon and it's obvious that he is yelling something. OK, so maybe it's "Fire!" But is that what someone in the military would actually say? What is the name of the cord that is pulled to fire a howitzer? What would a soldier yell just... show more
    I have an old picture of my father's artillery unit. One shows a soldier about to fire the weapon and it's obvious that he is yelling something. OK, so maybe it's "Fire!" But is that what someone in the military would actually say? What is the name of the cord that is pulled to fire a howitzer? What would a soldier yell just before pulling it?
    2 answers · Military · 1 year ago
  • When do I need a Windows partition on a Mac?

    If I get a Mac computer, under what circumstances do I need a Windows partition on my disk to support Windows programs? I have some third party programs that are not supported for a Mac. When does Windows emulation work and when doesn't it? One program in particular that I'm concerned about uses TCP/IP and Jumbo Frames to communicate on... show more
    If I get a Mac computer, under what circumstances do I need a Windows partition on my disk to support Windows programs? I have some third party programs that are not supported for a Mac. When does Windows emulation work and when doesn't it? One program in particular that I'm concerned about uses TCP/IP and Jumbo Frames to communicate on Ethernet. I'm not sure what sort of device drivers it might be using. How can I tell if program will work under Windows emulation?
    2 answers · Software · 2 years ago
  • Is there a minimum time between lives?

    After a person dies, is there a minimum amount of time that the spirit resides in the other realm (I don't know what else to call it) before taking on a new form, or can it be essentially immediate?
    After a person dies, is there a minimum amount of time that the spirit resides in the other realm (I don't know what else to call it) before taking on a new form, or can it be essentially immediate?
    10 answers · Religion & Spirituality · 2 years ago
  • Microsoft Windows updates?

    Last night I wanted to do a major data copy - nearly a Tbyte. I knew it would take a long time so I set it to run overnight. I didn't want some random Windows update to terminate my copy process, so I unplugged the Ethernet cable that is my computer's connection to the internet. Much to my great disappointment this morning when I woke up... show more
    Last night I wanted to do a major data copy - nearly a Tbyte. I knew it would take a long time so I set it to run overnight. I didn't want some random Windows update to terminate my copy process, so I unplugged the Ethernet cable that is my computer's connection to the internet. Much to my great disappointment this morning when I woke up the computer, I saw a login screen. Microsoft had managed to reboot my computer (and of course, trash my copy) without my computer even being connected to the internet. So what happens then? Does Microsoft download updates that contain a time bomb set to run at some particular time?
    3 answers · Software · 5 years ago
  • How to measure magnetic field intensity?

    I want to measure H, not B The magnets in question are permanent magnets (large Neo or SmCo magnets), not coils =====================....Steel ____........................____ |..N..|........................|..S..| |..S..|........................|..N..| -------------------------------| |...............very.................| |......high... show more
    I want to measure H, not B The magnets in question are permanent magnets (large Neo or SmCo magnets), not coils =====================....Steel ____........................____ |..N..|........................|..S..| |..S..|........................|..N..| -------------------------------| |...............very.................| |......high permeability......| |............material..............| -------------------------------- ^^^^^ Magnetic circuit ^^^^^ How can I determine the magnetic field intensity or the mmf of the magnets? The measurement needs to be something I can actually do, not some giant set of Helmholz coils in outer space
    1 answer · Physics · 5 years ago
  • Can steel be made magnetically soft?

    Can steel be heat treated or otherwise changed from magnetically hard to magnetically soft? I want to use steel wool bits to visualize magnetic fields. The iron filings that you can buy for the purpose are junk - very irregular in shape and size. I have not found any source for high quality filings. I want long, thin particles, where... show more
    Can steel be heat treated or otherwise changed from magnetically hard to magnetically soft? I want to use steel wool bits to visualize magnetic fields. The iron filings that you can buy for the purpose are junk - very irregular in shape and size. I have not found any source for high quality filings. I want long, thin particles, where "long" may be 1-2 mm and "thin" is 20% or so of the length. High aspect ratio is another way to put it. Particle length can certainly have a good degree of variability; I'm more interested in the high aspect ratio. If you imagine small bits of 0000 steel wool, that's what I'm looking for. But steel will retain a field once it has been exposed to a magnet. I want the particles to be magnetically soft so they don't retain the field. Is there any way to treat bits of steel wool to make it magnetically soft, or is there a source for high aspect ratio iron (not steel) bits?
    1 answer · Engineering · 5 years ago
  • What kind of fluoride is used in drinking water?

    People talk about fluoride in drinking water, but never say whether it's stannous fluoride, calcium fluoride, sodium fluoride or, heaven forbid, hydrogen fluoride. Even papers written by people who should know better simply refer to "fluoride" as though everyone is supposed to know what they're talking about. So, what kind of... show more
    People talk about fluoride in drinking water, but never say whether it's stannous fluoride, calcium fluoride, sodium fluoride or, heaven forbid, hydrogen fluoride. Even papers written by people who should know better simply refer to "fluoride" as though everyone is supposed to know what they're talking about. So, what kind of fluoride do they use, and what would be a typical concentration?
    3 answers · Chemistry · 5 years ago
  • Mirrorless camera with viewfinder and low shutter lag?

    Do any exist? I am old enough that I cannot use an LCD live view without finding and putting on some glasses. Besides, I'm so accustomed to an SLR that I instinctively hold a camera to my eye rather than looking at its back side. I really need a viewfinder. Also, being accustomed to SLRs, I find the shutter lag on small cameras to be... show more
    Do any exist? I am old enough that I cannot use an LCD live view without finding and putting on some glasses. Besides, I'm so accustomed to an SLR that I instinctively hold a camera to my eye rather than looking at its back side. I really need a viewfinder. Also, being accustomed to SLRs, I find the shutter lag on small cameras to be aggravating to the point that I want to throw something, including the #$^@%* camera. It drives me crazy to push a shutter release and have nothing happen (until it's too late to get the photo) So, are there any mirrorless, interchangeable lens cameras in existence that have a viewfinder and low shutter lag?
    3 answers · Cameras · 5 years ago
  • Computer mouse - red/blue LED?

    Some computer mice use a red LED, some blue. Microsoft touts how wonderful their blue LED mouse is, but I find it to be very finicky about the surface that it's on. What are the advantages/disadvantages of each color. I can see where blue might edge out on precision, but really, we're talking 630 nanometers vs 470 nanometers. I can't... show more
    Some computer mice use a red LED, some blue. Microsoft touts how wonderful their blue LED mouse is, but I find it to be very finicky about the surface that it's on. What are the advantages/disadvantages of each color. I can see where blue might edge out on precision, but really, we're talking 630 nanometers vs 470 nanometers. I can't imagine the resolution makes that much difference. I'm more interested in robust tracking than in precision.
    4 answers · Add-ons · 5 years ago
  • What is the usable power output of toy steam engines?

    such as this: http://www.ebay.com/itm/Jensen-Model-75-... Can I compute it from the bore and stroke of the cylinder and the steam pressure? If I wanted to attach a small generator to an engine of this type, how much power could I realistically expect to be able to generate? Links, comments, equations all welcome
    such as this: http://www.ebay.com/itm/Jensen-Model-75-... Can I compute it from the bore and stroke of the cylinder and the steam pressure? If I wanted to attach a small generator to an engine of this type, how much power could I realistically expect to be able to generate? Links, comments, equations all welcome
    1 answer · Engineering · 5 years ago
  • Commercial property investments?

    Where can I find out about the ins and outs of investing in commercial acreage? Most information that I find seems to be focused on commercial real estate that already has construction. What financing arrangements would be common for commercial acreage? How much of a down payment is typical? What sort of a term is typical? What are the rates... show more
    Where can I find out about the ins and outs of investing in commercial acreage? Most information that I find seems to be focused on commercial real estate that already has construction. What financing arrangements would be common for commercial acreage? How much of a down payment is typical? What sort of a term is typical? What are the rates like? What factors affect how flexible a seller can be with the price? What criteria are commonly used to determine whether or not a particular piece of property makes a good prospect? What sort of gotchas live in this market?
    5 answers · Renting & Real Estate · 5 years ago