How does spacecraft/rockets accelerate in vacuum while there's no gas present to apply force on in order to accelerate?
What is a rocket engine thrusting against in space?
How exactly does curved space-time describe the force of gravity? Narration cartoon about a town that has weird paranormal occurrences in it Video produced from images only plays in VLC but no other players Quantifiers "most" vs. "most of" Sort sections according to alphabetical order Is it possible to tell latex, that it should sort the sections you used in your document according to their alphabetical order in the final pdf document? I.e. I want to have something like this  \begin{document} \section{A} \section{C} \section{B} \end{document}   and in the pdf I get the result as  A B C   Is that possible, and if yes, how? Putting the sections into separate files is not preferred (but possible if scripted) due to having ~300 sections. Edit: I can also rewrite it as   \begin{sortEnvironment}{Title} Content \end{sortEnvironment}   if that makes it easier. Command Options on Command Line - Details and Functions? Logistic regression is predicting all 1, and no 0 I am running an analysis on the probability of loan default using logistic regression and random forests.    When I use logistic regression, the prediction is always all '1' (which means good loan).  I have never seen this before, and do not know where to start in terms of trying to sort out the issue.  There are 22 columns with 600K rows.  When I decrease the # of columns I get the same result with logistic regression.   Why could the logistic regression be so wrong?  **Actual from the data**  0 :   41932  1 :   573426  **Logistic regression output**   prediction for 1 when actually 0: 41932 prediction for 1 when actually 1:573426  A**s you can see, it always predicts a 1**   **Random forests does better:**  actual 0, pred 0 : 38800  actual 1, pred 0 : 27  actual 0, pred 1 : 3132 actual 1, pred 1 : 573399 I posted a question which was closed as off-topic and it seems like it could fit on another site in the network. How can I go about moving it there?   What is migration? When can a question be migrated, and who can migrate it? When should I consider migration, and when is it inappropriate? What causes a migration to be blocked and what happens after? What causes a migration to be rejected and what happens after? Anything else I should know about migration? I accidentally killed a noble, now every guard wants to kill me. Is there any way I can get rid of the bounty? What article should be used in the following sentence?     He was English by [a/the/] blood.   I feel there should be a zero article here, but I was taught that the zero article is impossible in English. I opened the PC in the morning, and this is what I got:      As is visible the icons of the UWA apps were no affected and the start menu also is unaffected.    When Control Panel is in category view the entire page is empty and in large/small icons the name is visible, no icons.  I deleted the iconcache.db in %USERPROFILE%\AppData\Local folder. Following the instructions here: . But to no avail and now windows is not rebuilding the cache.   I also ran sfc /scannow but no changes took place.  What should I do?  (01/01/2016 8:00PM GMT +5:30) Edit: I tried opening the system properties and I got 0x8000ffff error and this:        Then I closed the popup and pressed the OK button on the System Properties Windows and I got 0x8007057A error:      Opening the Image Backup Control Panel page I again got an 0x8007000E error:        I tried using system restore via advanced startup but once again I got 0x800FFFF error.  P.S.: I did try restarting, didn't work. How to install Windows 10 Home 19018 update? I'm using windows home edition, I have the latest update installed 1909.  I want to install docker for windows 10 home edition. It keeps saying  Docker Desktop requires Windows 10 Pro/Enterprise (15063+) or Windows 10 Home (19018+).  Should I join Windows insider? How long should I wait for that update to be released if I don't want to join windows insider? Why lipophilic molecules can pass phospholipid bilayer, in spite of 2 hydrophilic layers? It is commonly told that, hydrophobic/ lipophilic/ nonpolar molecules can quite easily pass phospholipid bilayer, and hydrophilic (polar or ionic) molecules can't pass (when no protein aid that); because hydrophobic nature of the lipid.  But in the same logic, hydrophobic molecules shouldn't pass through the bilayer. Because there are 2 hydrophilic layers in the membrane. i.e.      A and A' .  Then how the hydrophobic molecules can pass through A and A'?   I guess, it is due to thin diameter of A and A' . Is that? Does every holomorphic function $f$ defined on an open set $U$ have a primitive? Are expletives (cursing, swear words or vulgar language) allowed on SE sites? I need an adjustment layer which will invert in the same way as when you select some text in a text layer I edit a lot of posts every day. I often run across posts with 'Hi' and 'Thanks' on the top and the bottom of the post respectively. I also run across things like:     --User   Should these items be removed during the editing of the post by an editor? How to pass parameters to an alias? The phrase "sleeping with someone" often means "having sex." What is the origin of this sexual connotation? Is there a non-sexual equivalent of this phrase to express sleeping with someone without sexual intercourse? An interesting exercise about converging positive series, involving $\sum_{n\geq 1}a_n^{\frac{n-1}{n}}$