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Automatically generate thumbnails for all subfolders of a directory in Windows 7? Ratio of Boys and Girls In a country where everyone wants a boy, each family continues having babies till they have a boy. After some time, what is the proportion of boys to girls in the country? (Assuming probability of having a boy or a girl is the same) Rotate (group) objects outwards on spherical particle system? What does Geordi see on the holodeck? We've seen how he interprets people and things with his VISOR, but if the holodeck is all force-fields and holographic imaging, how does he interact in a similar way to other members?   What does the holodeck look like to Geordi LaForge using his VISOR? What is virtual memory? I was double checking my notes for 'Virtual Memory' and the definition in my text book is:     Process of allocating a section of secondary storage to act as part of the main memory   Where as  says:     Virtual memory is a computer system technique which gives an application program the impression that it has contiguous working memory (an address space)   and (Wikipedia also says)     Note that "virtual memory" is more than just "using disk space to extend physical memory size"   Can anyone offer any clarification as to which is correct? I am looking for a textbook that treats the subject of Special Relativity from a geometric point of view, i.e. a textbook that introduces the theory right from the start in terms of 4-vectors and Minkowski tensors, instead of the more traditional "beginners" approach. Would anyone have a recommendation for such a textbook ?  I already have decent knowledge of the physics and maths of both SR and GR ( including vector and tensor calculus ), but would like to take a step back and expand and broaden my intuition of the geometry underlying SR, as described by 4-vectors and tensors. What I do not need is another "and here is the formula for time dilation..." type of text, of which there are thousands out there, but something much more geometric and in-depth.  Thanks in advance. Hide a Field From ONE User Scenario: If I had a Custom Profile / Standard Profile, say Sales,and I have 50 Users assigned to the same Profile and had same Permission / Access on a particular object (Could be Standard or Custom Object), if I were to Hide a Field ONLY TO ONE USER, which would be  a better Solution to achieve this WITHOUT EDITING OR TOUCHING THE PROFILE??  Option 1: Create a Custom Profile for this particular User and give CRED access (I know this one isn't a good solution as I got a Thumbs-down from a Technical Architect)  Option 2: Create a Permission Set - Go to the particular Object,say, Accounts, Object Permission Enabled -->Field Permissions-->Remove READ Access - This would make this particular field hidden from the Object to the Profile. Then Assign this Permission to particular User whom I don't want to see this field.  I would go with the 2nd option but I still hear a groan. Where am I going wrong? How would you hide a particular field from ONE User out of 10 Profiles who have the same Access Rights?  What's the best possible solution to hide a Filed from only one User out of 10 Users who have the same Profile. Steady-State Current I am in the process of completing some homework and have come across a question that says: "What is the steady-state current?" It is asking in reference to a circuit that includes two capacitors in parrallel and a DC source of 24V and an AC source given by $\epsilon = 20 \cos(120 \pi t)\ \text{V}$, where $t$ is in seconds. I assume that it is asking when the current is constant. Because naturally the current is not constant due to the AC source, would I just consider the DC source for this? Do lenses have focal planes or focal spheres/ellipsoids? Why would I vote for an increase in the number of authorized shares? Copying applications from applications folder to external and reinstalling osx Is it possible to copy all my applications from the applications folder onto an external, format my mac, reinstall OS X and finally copy the applications back into the applications folder for installing them?  Will that work? I am asking because my macbook seems to be behaving in a very odd manner, has become excessively sluggish and is preventing me from recording anything in logic.. I have tried the usual freeing up space, clean desktop, fixing permissions, verifying and repairing disk as well as resetting pram and making sure I have all the latest software and firmware updates. The macbook is only 8 months old and is running Lion with 8gb of ram, I really cannot understand what is wrong with it. Even when trying to watch a movie, the player will get serious audio/video synchronisation issues and I noticed that every time my wifi is on the fans speed up like a plane taking off. I even checked and it is clean from any dust. I am perplexed :(   If anyone could help me please, I would greatly appreciate it.  Thanks in advance! What is the best way to filter a Java Collection? Suppose I have a line segment of length $L$.  I now select two points at random along the segment.  What is the expected value of the distance between the two points, and why? Words to describe people with good/poor vocabularies Words to describe people with good/poor vocabularies. I am looking for words which I can use to describe characters and I would also like to describe their vocabularies, and explain how their vocabularies stem from their upbringing the_excerpt not displaying Splitting all lines in layer at vertices using QGIS What is the difference between update-grub and update-grub2? I'm making some changes on my grub file under /etc/default/grub. In some tutorials I have seen sudo update-grub and others sudo update-grub2. What is the difference? How do I convert an argument list to a sequence of arguments? Partial or entire Image Blurring in TikZ?  I have seen some examples of drop shadow blurring in the pgf-blur package version 1.01 by Martin Giese but this isn’t what I mean.  Is it somehow possible to do partial or entire Image Blurring in TikZ, just like what one may do in Adobe Photoshop? For $a,b,c,d \in \mathbb{R}$, is $\sqrt{a^2+b^2} + \sqrt{c^2+d^2} \geq \sqrt{(a+c)^2 + (b+d)^2}$? I have tried to show this using the fact that $\sqrt{x+y}\leq\sqrt{x}+\sqrt{y}\; $  for non-negative $x,y$ but haven't been able to arrive at a proof.