Could I pick up a human with a strong enough magnet?  Humans contain magnetic materials, such as iron.
There is iron in our blood, which is magnetic. Roughly how strong would a magnet have to be to induce a noticeable attraction? It would be nice to know this for several distances. Also, do electromagnets that strong exist?
"How to [...]?" and "Where to [...]?" Questions that are not questions. Is this defensible? Adding a question mark to the end of a "How to" or "Where to" sentence appears to be quite common. Here are two examples from this very site:  How to punctuate a list of questions? ()  Where to put the periods when using a parenthetical sentence? ()  In my mind, the question mark doesn't belong at all, and it bothers me.  Am I being unreasonable? Is this practice defensible? If I multiclass into 2 or more spellcasting classes, how do I determine my known/prepared spells? Let $V$ be a finite dimensional vectorspace over a field $\mathbb{ F}$. It's easy to show that if $U$ and $V$ are subspaces of $V$ then $U \cap V$ is a subspace. But what if there are an infinite number of them? I have seen sometimes in pure maths that you take an arbitrary finite collection of sets and show the statement you are trying to prove is true for them to deduce it is true for the whole infinite collection. Why is this technique allowed? Can I do it for this case? Why? better Curve/Text to Mesh generation? The triangulation process of Text to Mesh or Curve to Mesh generates some nasty topology.   I get why, but maybe it could be done a bit nicer? Since text is flat, have ngons instead of hundreds of triangles you'll need to modify anyway?  Another issue is when you then want to use the text as a Volume for particles, which for some reason behave weird when you have unusual topology even though they should be using the volume, not vertex or face positions. I'm creating a composite image, in order to create a timeseries. I've already created the composited image, but i am having difficulty masking the clouds of the composite image. I've followed the code from a page having similar problems, however when I run the code (after replacing all the l8_mayo to composite as that is the name of my composite var), I get the error code of composite.map not a function. This error does not come up when I run the exact same code from the previous answer. Can someone explain how to overcome this problem? Here is the page I used:  here is my code and the link to my code:  (point is the long, lat for Lake Manyara, Tanzania)  //load images for composite var sr14= ee.ImageCollection('LANDSAT/LC08/C01/T1_SR') .filterBounds(point) .filterDate('2014-01-01','2014-03-01') .select(['B4','B3','B2']);  // Temporally composite the images with a maximum value function. var composite = sr14.max(); Map.setCenter(35.8244, -3.5799); Map.addLayer(composite, {}, 'max value composite');  var getQABits = function(image, start, end, newName) { // Compute the bits we need to extract. var pattern = 0; for (var i = start; i &lt;= end; i++) {    pattern += Math.pow(2, i); } // Return a single band image of the extracted QA bits, giving the band // a new name. return image.select([0], [newName])               .bitwiseAnd(pattern)               .rightShift(start); };  // A function to mask out cloudy pixels. var cloud_shadows = function(image) { // Select the QA band. var QA = image.select(['BQA']); // Get the internal_cloud_algorithm_flag bit. return getQABits(QA, 7,8, 'Cloud_shadows').eq(1); // Return an image masking out cloudy areas. };  // A function to mask out cloudy pixels. var clouds = function(image) { // Select the QA band. var QA = image.select(['BQA']); // Get the internal_cloud_algorithm_flag bit. return getQABits(QA, 4,4, 'Cloud').eq(0); // Return an image masking out cloudy areas. };  var maskClouds = function(image) { var cs = cloud_shadows(image); var c = clouds(image); image = image.updateMask(cs); return image.updateMask(c); };  var composite_free = composite.map(maskClouds);  Map.addLayer(composite_free, 'composite collection without clouds'); My father-in-law is a builder. He has put in 20 amp and 15 amp breakers, and ran 12-2 as the home runs to the switch's and the first plug to make them hot. He then ran 14-2 to feed the rest of the plugs, lights, and ceiling fans.   Is it okay that he used different gauge wires on the same circuit? finding and replacing elements in a list Assume that $M$ and $N$ are two finitely generated $R$-modules. Then $\operatorname{Hom}_{R}(M,N)$ is a finitely generated $\mathbb Z$-module and/or $R$-module (in this case, assume that $R$ is commutative)?   Note that $R$ is not Noetherian ring. Is there any counterexample (for any cases)? Is it possible in blender to change the dimensions of a downloaded 3d model in .blend format or .obj format in blender using python scripting? I am totally new to blender, I have downloaded a 3D model of a humanoid and am able to see it in blender. I want to change its dimensions and size in all perform editing on by changing its size, height, arm width, length, etc. In a more clear picture of the question, suppose i have 5 persons whose 3D model I have to make automatically, so I want to change the dimensions of that humanoid to match the body measurements of these people. If I can mark those points manually on the humanoid and define parameters of shoulder width, arm length, height, etc and just input the values then my project can go a little forward. The model I am using is attached in this link,  Please if anyone can tell me if it is possible to edit the model by defining certain parameters through python scripting. I need it as an add on for my project. And i just need to know how can i do that rest i shall experiment and do. Using sets of arguments from a list Harry is a half-blood and Ginny is a pure-blood, so what does that make his children? I've been told it means they are pure-bloods but I can't be sure. What do you think? UK coastline shapefile? How should I install HPLIP binary/proprietary plugin/driver for my HP printer or printer+scanner? Adding Table to Layout View using ArcPy? I am using ArcGIS 10.1 and I have a non-spatial table and some layers in a Data Frame.   When I switch to Layout View I want to be able to show the map in a data frame element and the table in another element (something that one could do with "Add Table To Layout" from Table Options, but I want to do this in one step without having to go to Table Options).   Is there a way to do this using ArcPy?   I couldn't find any function in the ArcPy library that would create a new Layout Element ... and then I also don't know how to add the contents of the table to the Layout Element. Number of elements in the quotient ring $\mathbb{Z}[X]/(X^2-3, 2X+4)$ Separator between command list and } While explaining to my nephew about the physics of light, I told him we cannot see infrared color, and he kicked back with a very simple question: why can't we see it? I could not tell him. Is the human eye unable to sense such light or can it indeed but the brain can't understand the signal? any other reason? Prove by induction. How do I prove $\sum\limits_{i=0}^n2^i=2^{n+1}-1$ with induction? How to create my own math operator with limits? How can i write my own math operator with limits? I want it to look like:  \sum\limits_{e=1}^{m} but with a capital A (if possible bigger than the normal text) instead of the sum.  Thanks for the help! Why does the natural ring homomorphism induce a surjective group homomorphism of units? I'm trying an old problem here:   Suppose $n\mid m$, and I have a natural ring homomorphism $\varphi\colon \mathbb{Z}/m\mathbb{Z}\to\mathbb{Z}/n\mathbb{Z}$ defined by $\varphi(j)=j\mod{n}$. I can verify that this is a ring homomorphism, but why does it induce a surjective group homomorphism on the unit groups $(\mathbb{Z}/m\mathbb{Z})^\times\to(\mathbb{Z}/n\mathbb{Z})^\times$?  My question in particular is why is it surjective? I take $k\in(\mathbb{Z}/n\mathbb{Z})^\times$. Then there exist integers $s,t$ such that $sn+tk=1$. Since $n\mid m$, I can also write $m=na$. So multiplying through I get $sm+tka=a$. I'm lost here. How can I find a unit in $(\mathbb{Z}/m\mathbb{Z})^\times$ which maps to $k$ to show surjectivity?