Questions in the Science & Nature category.
Displaying 1 through 20 of 5081 (random). Subscribe:
My math is a bit rusty, I would like to calculate the surface of a helix [more inside]
What's this goose-like bird I saw in Oakland, CA this evening? [more inside]
Submitted for your consideration: Two photographs of the same place- in 1974 and 2014. [more inside]
We tried to do the Iodine Clock Reaction today for the kids, using 1) HSO3 mixed with starch and 2) KIO3. Unfortunately, instead of changing from colourless to dark blue (cue impressed sounds from the kids) there was no colour change at all. No precipitate or apparent temperature change, either, so I'm not sure anything at all happened chemically. Any ideas what might have gone wrong?
Can working memory impairment be reliably inferred from a diagnosis of ADHD? How often do individuals meet the diagnostic criteria for ADHD without showing substantial impairment on measures of WM? Is it appreciably often the case that WM memory deficits in childhood and early adolesence are resolved during the process of maturation?
What happened just before and after this 1/4000th of a second of a swift's flight? Birds aren't planes so my guess of rapid clockwise rotation is probably wrong. Many swifts were feeding. Some would dive, level out along this wall then abruptly turn away. I'm not sure they were swifts, but other photos show the forked tail. Photo taken in Fes, Morocco.
What on earth is this item of chemistry glassware for?
Why does seltzer explode on the regular but flavored sodas rarely do under the same conditions? [more inside]
I found two of these guys crawling on me during a 2 night hotel stay, but couldnt find any more in the bed, or any other evidence of bedbugs, no bites that i can find.. What do you think? http://imgur.com/a/d0KUP
Please help me understand if this is a bedbug. [more inside]
It takes 10 kilocalories of fossil-fuel to make 1kcal of food. You use 80kcal to walk a mile. There are 31520kcal per gallon of gasoline. 80kcal * 10 = 800kcal of fossil-fuel per walking-miles. 31520kcal/800kcal=39.4 walking-miles/gallon of gas? What am I missing? Can I trust the 10:1 fossil:food ratio?
Walking through historic Chestertown, Maryland, last week, and saw this
Hellspawn bird sitting on someone's front porch. Staring... [more inside]
What types of crystals should I look into growing if I want them to grow/attach onto a wooden panel? [more inside]
I am looking for articles, case studies and examples in which researchers in the social sciences change (or consider changing, or are called on to change) research instruments (questionnaires, rating scales, assessment measures) to accommodate changes in social values. Specifically, I am interested in the discourse and debate around these changes, and the ways in which researchers attempt to manage the inherent statistical risks to internal validity instrument change entails. What should I read? [more inside]
I've heard this bird ever since childhood, but have never been able to identify it. [more inside]
In the last two days I've noticed about a dozen tiny, almost microscopic bugs crawling around, into and out of my Macbook Air keys. I'm freaking out, not only because I'm worried they're going to destroy the laptop but because this could potentially be a bigger problem in the house. [more inside]
Need help identifying a tree from Utah. [more inside]
I have a physics question, but my googling hasn't been able to provide anything satisfactory tonight. It's about cosmological models of creation in which NO initial conditions whatsoever are assumed. [more inside]