Wikipedia:Reference desk/Archives/Science/2022 January 15

= January 15 =

Limbic brain differences by sex
I know there’s a lot of debate between whether male and female brains are actually different or whether there’s more difference within sexes but is there a consensus within the scientific community? Or is it an unknown? 2A02:C7F:EA3E:8000:A148:49C0:24BF:F257 (talk) 10:18, 15 January 2022 (UTC)
 * The further to one side of the distribution the more likely the human is to feel male or female (which has nothing to do with their sex). I bet you could bet what gender someone from the outer 50% (could be much more) of humans identifies with with no information besides modern scans of alleged brain differences and get it wrong far less than guessing from sex but 2022 tech being able to read some aspects of some humans like a book offends some people. Especially one end of the feely/thinky, metaphysical/physical, humanities people/STEM people or non-woke/wokest spectrum. Would seem dehumanizing to actually do this behind their back though (with or without betting), you'd need full consent in advance to pass the science ethics board anyway which would add sampling error to this kind of paper (if any exist). Sagittarian Milky Way (talk) 15:53, 15 January 2022 (UTC)
 * There seems to be consensus that adult men have, on average, larger brains than adult women (see brain size), so that's one "difference". However, as that article discusses, linking that to intelligence is controversial. Mike Turnbull (talk) 17:14, 15 January 2022 (UTC)
 * Wouldn't you need more brain to have a larger body with the same density of pain, heat, touch, etc. sensors? I recall that Neanderthals had slightly larger braincase volumes than modern humans. Sagittarian Milky Way (talk) 18:21, 15 January 2022 (UTC)


 * Compared to women, men have excess brain capacity. Women use their brains to solve problems. Men use the excess capacity to create problems. :) --Lambiam 21:56, 15 January 2022 (UTC)


 * Male or female? Brains are intersex. Alansplodge (talk) 23:18, 15 January 2022 (UTC)

Are there any timers exist on historic cameras?
I am referring to this. How Frances Benjamin Johnston took her own photograph i.e self portrait in 1890s? Rizosome (talk) 15:53, 15 January 2022 (UTC)
 * Well before the IP user reverted himself there was a link to History of the Selfie. There you'll see that Kodak Brownies of the 1890s had timers.  One other option was to hide the bulb tube that photographers of the time used. Martin of Sheffield (talk) 16:26, 15 January 2022 (UTC)
 * The availability of self-timers in the late 1880s allowed for an ease for creating self-portraits, since it gave five to ten seconds for the subject to position themselves in the shot. The launch of the portable Kodak Brownie Box camera in 1900 led to self-portraiture becoming a widespread technique.
 * 2603:6081:1C00:1187:3C0B:A7B2:2DD7:ED6B (talk) 16:31, 15 January 2022 (UTC)
 * Oops, yes, you're correct. Martin of Sheffield (talk) 16:38, 15 January 2022 (UTC)
 * Please update our self timer article...it's pretty poor shape. DMacks (talk) 23:00, 15 January 2022 (UTC)


 * An example of an 1890 shutter timer is here. Alansplodge (talk) 23:32, 15 January 2022 (UTC)


 * Please explain "hide the bulb tube". —Tamfang (talk) 01:41, 18 January 2022 (UTC)
 * One form of remote shutter release uses a rubber ball or "bulb" (yep, that's how the "B" setting got its name) on the end of a thin tube to actuate the release. Martin of Sheffield (talk) 08:55, 18 January 2022 (UTC)Bulb shutter release.JPG

I got an answer from here: An example of an 1890 shutter timer is here. Rizosome (talk) 07:53, 16 January 2022 (UTC)