Does washing an apple with cool water remove most of the wax and residue? :  You'll remove most of the wax and residue by rinsing the apple under cool water  Is this true? Ideally, I'd like for some actual scientific research that compares various methods for washing/cleaning apples.
Cleaning wax and pesticide from apple skin I love apples. I like to eat them with skin as it has plenty of fiber in the skin. But apples are famous for wax and pesticides on the skin which I don’t want to ingest. I have read many articles on the web and suggestions for removing the wax from the surface.   These suggestions include soaking in vinegar or hot water and other methods. They suggest that soaking apples in vinegar removes the wax that can be seen in the vinegar. I have done that, but never seen any residue of wax in the vinegar.   So I have set aside a new kitchen sink Scotch-Brite scrubber for this purpose and been scrubbing the apple skin under running water before eating. I think this method should remove most of the wax and pesticides. I would like to hear your input.
It is possible to find an efficient algorithm for constructing a provably hard to factor number $N$, together with a witness that shows that it is indeed hard to factor. EDIT, since it was not clear: I also want to be sure that even the person that constructed the number cannot factor it.  Of course, a random large enough integer is going to be hard to factor with high probability, but we might be unlucky.  There are also multi-party protocols for shared generation of RSA moduli (such as ), but I would like a non interactive technique.  Motivation: This was suggested by Poncho's answer to Natural number solutions to $\frac{xy}{x+y}=n$ (equivalent to $\frac 1x+\frac 1y=\frac 1n$) I have a question about the following problem from a Putnam review:  Let $n\in \mathbb{N}$. Find how many pairs of natural numbers $(x, y)\in \mathbb{N}\times \mathbb{N}$ solve $$ \frac{xy}{x+y}=n. $$  I have found some solutions for all $n$, such as $(2n, 2n)$ and $(n+1, n(n+1))$, but I feel as though this is the wrong approach, as the question is only asking for the number of solutions to the equation.  I don't really want a complete solution, but any hints would be greatly appreciated. When users create a node, they should be redirected to a payment page; if payment is successful, the user can see the node.  Is there any way to achieve this? Update: Failed to lock /var/cache/apt/archives/lock Standard library sort and user defined types Inverse of Heine–Cantor theorem Finding a 2x2 Matrix raised to the power of 1000 Settings disappeared in Ubuntu 19.10 I usually go to the right top corner and at the drop down menu I select the tool icon to go to the settings.  However, 19.10 does not have a tool icon.  How can I go to settings now? can I put a double 50 amp pole in a 100 amp box Display Blank when Referencing Blank Cell in Excel 2010 I have an Excel 2010 workbook that contains a number of individual worksheets. The cells on one of the sheets are linked to individual cells on two other worksheets in the same workbook.  I'm using a direct cell reference that essentially says that whatever value is entered into a particular cell on one sheet also populates cells on two other sheets.  I used the (=) function with the cell reference to accomplish this.  The issue I'm running into is that, even when the primary cell is left blank, the cells that populate from that primary cell will display 0, rather than remaining blank themselves.  I want the subordinate cells to remain blank if the primary cell they're linked to is blank. How we differentiate between flash memory and SD card memory? If $z$ lies on the circle $|z-1|=1,$ then the value of $\frac{z-2}{z}$ is If $z$ lies on the circle $|z-1|=1, $ then the what is the value of $\frac{z-2}{z}$ ($z\ne 0 \ \text{and} \ 2$ ) is?  What I am aware of : the equation $|z-1|=1$ represent a circle with  centre $(1,0)$ and radius $1$. Also $$|z-1|=1 \implies (z-1)^2=1 \\ \implies  z^2-2z+1=1 \implies z(z-2) =0$$ $\implies z = 0; z =2 $ I think this is wrong.. please suggest thanks.. "Access denied" when trying to end a process on Windows 8 What do you call the feeling you get when you're satisfied to the point of nausea? So you're craving something, say a particular chocolate or sex with one very attractive person that you desire. Take the sexual encounter one for example. You sleep with the person so many times until you are fulfilled. But it gets somewhat "nauseating" to enjoy that thing again (the sex or the chocolate) because you've overindulged earlier.   Now what is that feeling called, the feeling of being overly "satisfied" or "quenched" to the point of nausea?  I wouldn't say what I'm looking for is satisfaction or quench. Is there a more specific term?  Example sentence:     "I've been eating T-bone steak all day yesterday. I had leftovers today, but I couldn't eat them - I'm just so ____ towards (or from) steak right now." Duo of alien xenologists study couple of Terran explorers, later save them How can I prove $\sqrt{2} ^{\sqrt{2}}$ is irrational? Central Moments of Symmetric Distributions I am trying to show that the central moment of a symmetric distribution:     $${\bf f}_x{\bf (a+x)} = {\bf f}_x{\bf(a-x)}$$ is zero for odd numbers. So for instance the third central moment $${\bf E[(X-u)^3] = 0}.$$ I started by trying to show that $${\bf E[(X-u)^3] = E[X^3] -3uE[X^2] + 3u^2E[X] - u^3}.$$ I am not sure where to go from here, any suggestions? Is there a better way to go about proving this? Do Bard and Rogue expertise stack? If you multiclass correctly so you get expertise from both bard and rogue(e.g. Rogue 1 and Bard 3), and if in both classes you put the expertise into Deception, does it stack on an ability check?   Example:   The bard/rogue is proficient in Deception.  With a 16 (+3) charisma at level 4 would the character get a +15 bonus to Deception rolls? Solving multiple congruences by CRT = Chinese Remainder Theorem TikZ is undergoing lots of development with new features being added, but the versions distributed with standard TeX releases are often a little old. How do I get the latest version? If I want to be sure that I get the latest stable version, how do I do that?    Note: I'm not asking this question for myself, but because a question like this seems to be useful for pointing to it when a new feature of TikZ is mentioned in an answer to some other question. Feel free to post answers for any operating system/TeX distribution combination.