Copper is a reddish metal. Galena is a greasy-looking greyish-silver rock. I'd probably use my eyes.
Go get in bed naked with your grandma, and see if you can distinguish that.
Fingerprints are different in identical twins.
Streak
This is just a guess, but I would assume the term is to distinguish it from fractional distillation.
Only by chemical analysis.
She could easily distinguish her sister's laughter from the rest of the crowd.
streak
Personally I would say Galena High School.
Assuming the specific gravity (density) of Galena is 7.6 grams per cubic centimeter, 300 grams would occupy a volume of 300/7.6 = 39.47368421052632 cubic centimeters.
i would distinguish whether it was healthy or not based on what is in it or what it's made with
Galena - cause of the hardness of only 2.5
You would have to look at the nurk of the base and the whapple of the acid and i it is an xx and yy it would distinguish because then it dismanages it but otherwise if it is xy yx then it physicaly can't distinguish experimentally without tasting it.
Martin Cooper invented the mobile phone and dreams that one day it could be embedded in our bodies. This would be able to send information and characteristics of a person to a computer and doctor where it could cure any illness.
Would you distinguish between what a good answer may be vs what a bad answer may be?
If gelena contains silver it's cost would depend on the wheight, but, by itself, gelena is not very valuable.
Introduce genes for different opsins that respond in the green region of the spectrum.
The value of an Anna Julia Cooper postage stamp would depend on various factors such as its condition, rarity, and demand among collectors. On average, a mint condition Anna Julia Cooper stamp could be worth anywhere from a few dollars to potentially over $20.