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Is the term "hack" more positive or more negative?

What emotional association does the word hack have nowadays in the first place: negative or positive? Is it more for doing something illegally or without permission? Or for doing something in a q...

english-language

What's the origin and reasoning behind the phrase, "I've got a monkey on my back"?

900lb Gorilla I can appreciate, but "I've got a monkey on my back" - two opposable thumbs down...

english-language

physics

How can we composite two piecewise functions?

Let say $$f(x) := \left\{\begin{array}{l l}x+1 &amp; \text{ if } -2\leq x&lt;0 \\ x-1 &amp; \text{ if }0\leq x\leq 2\end{array}\right.$$ How can we find out

mathematics

Which of these things is not like the others?

What's in a name? Well quite a lot, if you're confused enough. I have an engineering-style mathematics education, based on good old hand waving and learning bits and pieces from all over the p

mathematics

Using "exempli gratia" in essays

Can I use "exempli gratia" (short for e.g.) in place of "for example?" If so, do I need to add any words to it to completely replace the phrase "for example?"

english-language

Assumptions of Hamilton's rule

Which elements of the following list are assumptions of the Hamilton's rule? Population structure (non-panmictic population) Additivity = Fitness of the heterozygote equals the mean of the fit

biology

Compound words limitation

To what extent compound words are appropriate in English? Are the "onthedownburninghouseresting", "firesurrounded" valid words in English? Somehow I feel that the first one is not

english-language

Where I can find information about the study of animal vision?

I read a lot of articles on the internet about how dog see the the world. But I can't find the source of these study. I want to know how did scientist setup the experiment to find out animal visio

biology

When to use Binomial or Neg Binomial?

I have a problem that I'm not sure which distribution to use: 12 Toll employees were let go for taking more than 25,000 dollars in tolls. Lets say that one of the people let go on one day collect

mathematics

What is the lowest intensity threshold of light for photosynthesis in any species?

Recently, I was reading the question "Photosynthesis - light intensity, particularly the answer, that states that different species require different intensity of light. My question is what is t

biology

Can I compare Shannon indices of metagenome gene data?

I'm comparing 12 Metagenomes. I'm using HMM counts of a number of proteins known to exists as groups within certain operons. I have grouped the HMM counts for each type of operon and calculate

biology

Count on beat 2 and 4

Why do jazz and funk musicians count on 2 and 4 beats on a 4/4 beat? I've noticed that most musicians of other styles count on 1 and 3 or 1,2,3,4. Is there any advantage in counting on 2 and 4?

music

What does effect would Sulforaphane have on Kennedy's Disease?

Sulforaphane is a isothiocyanate found in cruciferous vegetables including broccoli and cauliflower. Its 2D structure is as follows: It's been found to serve as a histone deacetylase 6 (HDAC6)

biology

Can a person become addicted to tea?

Can one become addicted to tea like coffee addicts or smokers? I heard there are some common substances in tea and coffee, do they cause addiction?

biology

Assume I have simplicial sets $X:\Delta^{op}\rightarrow Set$ and $Y:\Delta^{op}\rightarrow Set$, then I can form the simplicial set \$\operatorname{Hom}(X,Y)_n := \operatorname{Hom}_{sSet}(\Delta^n...

mathematics

Theoretical considerations on the conservation of energy and the conservation of linear momentum

I report to you an interesting excerpt from my Physics book. It is an Italian version, so I apologize in advance, as I'm sure I won't give proper justice to its beauty in the translation as t

physics

harvesting fertilized eggs from Tetraodontidae species?

I would like to know how easy/difficult it is to harvest fertilized eggs from Tetraodontidae species such as Tetraodon nigroviridis or Takifugu rubripes compared to zebrafish? Ultimately, I would l...

biology

Will humans and animals be harmed by frequencies outside their hearing range?

The human ear (for example) is sensitive to frequencies from 20Hz to 20kHz. Any sound beyond that limit would not be heard by us naturally. Will it harm us (effect our ability to hear) when we hear

biology

Kinematics Word Problem

A curling rink is approximately 35 m long from button to button. Mr. Grover releases a rock and 20. seconds later it stops on the far button. What was the initial velocity of the stone? What

physics