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How random is JavaScript's Math.random?

For 6 years I've had a random number generator page on my website. For a long time, it was the first or second result on Google for "random number generator" and has been used to decide dozens, if not hundreds of contests and drawings on discussion forums and blogs (I know because I see the referr...
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Copy files without overwrite

I just can't seem to find a way on the command line to say "copy all the files from directory A to directory B, but if the file already exists in directory B, don't overwrite it, no matter which file is newer, and don't prompt me." ...
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How to change an application icon programmatically in Android?

Is it possible to change an application icon directly from the program? I mean, change icon.png in the res\drawable folder. I would like to let users to change application's icon from the program so next time they would see the previously selected icon in the launcher. ...
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Why is the clone() method protected in java.lang.Object?

What is the specific reason that clone() is defined as protected in java.lang.Object ? 11 Answers ...
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How do I alter the position of a column in a PostgreSQL database table?

I've tried the following, but I was unsuccessful: 9 Answers 9 ...
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How do I show the changes which have been staged?

I staged a few changes to be committed; how can I see the diff of all files which are staged for the next commit? I'm aware of git status , but I'd like to see the actual diffs - not just the names of files which are staged. ...
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Is there a Python function to determine which quarter of the year a date is in?

Sure I could write this myself, but before I go reinventing the wheel is there a function that already does this? 13 Answer...
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Export CSS changes from inspector (webkit, firebug, etc)

When I'm working with CSS, I'll often test in a browser - say, Chrome - right click an element, click Inspect Element, and edit the CSS right there. The use of arrow keys to change things like margin and padding makes lining things up super easy. ...
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How to convert a Django QuerySet to a list

I have the following: 9 Answers 9 ...
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Python pandas: fill a dataframe row by row

The simple task of adding a row to a pandas.DataFrame object seems to be hard to accomplish. There are 3 stackoverflow questions relating to this, none of which give a working answer. ...