Origin of the word "cancer" The disease was first called cancer by Greek physician Hippocrates (460-370 BC). He is considered the “Father of Medicine”. Hippocrates used the terms carcinos and carcinoma to describe non-ulcer forming and ulcer-forming tumors. In Greek this means a crab. The...

There's an image going around Facebook claiming that the @POTUS Twitter account is using an image from President Obama's inauguration. Is this true? Where is the original image from?

In American English, collective nouns are almost always treated as singular. In British English, it often depends on whether the speaker/writer sees the noun as a unit or as individuals. That seems to defeat the purpose of collective nouns, but that is how it is. http://www.usingenglish.com/foru...

Your question doesn't seem to be so much about what a clause modifies, but about how to determine the antecedent of a relative pronoun, (the noun referred to by that pronoun), in this case, "which." There are several considerations in making that determination. Proximity. The modifying clause...

It's not particularly common for expressions of time. It's similar to degrees-minutes-seconds: instead of decimal degrees (38.897212°,-77.036519°) you write (38° 53′ 49.9632″, -77° 2′ 11.4678″). Both are derived from a sexagesimal counting system such as that devised in Ancient Babylon: the sin...

Could someone maybe explain how the addition reaction between 1,3-cyclobutadiene and $\ce{Cl_2}$ works, and what the reaction products are? For 1,3-butadiene I know how it works with $\ce{HCl}$, but here I am completely lost and I cannot find it anywhere in my notes or on the internet.

There is no "pigment" that makes milk white. According to Wikipedia: A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption. Going by that definition of a "pigment", then there is no (white) pigment in milk. In fact...

In class, we learned about the Clemmensen reduction of carbonyl groups to the corresponding hydrocarbon. This is all well and good, except that it would also seem that the conditions used in the Clemmensen reduction might also affect other groups, such as the reduction of nitro groups to amino gr...

The mercury content of a stream was believed to be above the minimum considered limit $1\text{ppb}$. An analysis indicated that the concentration was $1.68\ \mathrm{ppb}$. We have to find how many $\ce{Hg}$ atoms are present in $15\ \mathrm{L}$ of water, the density of which is $0.998\ \mathrm{g ...