How do I safely delete all files, on Ubuntu Linux, with a specific extension (e.g. .bak) from current directory and all subfolders simply by using one command-line? I'm afraid to use rm because I used it wrong once and now I need advice. Is it possible to perform such action?

I've downloaded the latest iTunes version for Windows 64-bit and now every audio file has pops and clicks when playing. My pc is not outdated, and every other music player works perfectly fine for me. Could someone tell me if this had occured to them and how to solve it?

I've tried a few different USB wires to connect it on a few different computers and none of it can detect my Mega 2560 R3 which is possibly bricked. I've checked my device manager, and nothing is shown there.

But when the board is plugged in via USB, lights are on.

I'm new with Arduino, so if somebody have any ideas about it, it will be appreciated.

I have a older pc that my kids have been using. I decided to upgrade their system to make it a better gaming machine. When I went to log in I could not remember the admin password. Do I have to wipe the whole machine or is there a way to recover the password?

I have 3 email accounts created on Social Hub, how can I view sent folder while running ICS 4.0.3 on Samsung Galaxy S2?

Before, when I used Gingerbeard 2.3.6, it was pretty simple to move the other mail folder as well. But now there seems to be no such option.

Is there any way to see other mail folder like send items/ draft / myfolder?

I have files and folders created in different locations, such as a Windows 8 PC and a NAS. I'd like to back them up from time to time, for example to a destination folder on NAS or to any other local drive. I need free(if possible) open source, easy to use software that could do back-up on a schedule.

How hard is it to create GIF? I am aspiring to be a Web designer. I am currently working on picture formats to put on websites. I heard that GIF a small pieces of videos or animated pictures of a few seconds. I saw a few online and I was wondering how hard to make one is? 

Can anyone help me with skype video calling? I have recently got on skype as I have many relatives abroad and using skype to video chat helps to lower down the cost. Recently, I heard that skype was updated to support video-conferencing with many users. Can anybody help me on achieving that? Is it a paid service?

This week while reading a blog entry I saw that whatsapp was planning to introduce voice call for its texting client app. Can anyone confirm to me this news? Also, I would like to know the best app that is currently available for calling on Wi-Fi. I have used skype in the past but I am not satisfied with the mobile version. 

In the past we used duration for each story, but currently, we are using story points (effort) to keep the test team effort separated from the development team effort. Story points include complexity, effort, and doubt. These three traits will differ for a developer/programmer than with someone creating manual tests or someone creating automated tests. How can all of these different factors be combined to created an overall story point estimate?

According to Scrum these should be combined together (as it's a team effort), but how is this done? Is it just a combination...