i have recently solved a similar issue.on my windows PC the USB keyboard and USB mouse would stop working sporadically. some LED on the keyboard started flashing. and both, keyboard and mouse would just not respond any longer! in such situations i have always been able to remotely log into that windows machine to close any open documents, close any open programs and then trigger a reboot. after such reboot the keyboard and mouse would be working fine again on that local windows session. but only until the problem appeared again. a few minutes or a few hours later ... in the end it turned out that something must have been broken inside the cable of that USB mouse. when "moving" the mouse, that broken part in the USB cable must have occasionally caused some kind of "short circuit" or so. eventually leading to all "USB input" no longer working. the solution was as simple as dumping the old mouse and attaching a new USB mouse. the problem has never come back, since.
1. Keyboard similar to piano
I will refer to a particular model of the Kawai digital pianos.I had nearly the same dilemma a while back... I had been playing piano for 3 years, but strangely practised only on a keyboard. I rarely had access to a piano in school, and soon realised that I would need a proper keyboard (not an acoustic piano, because portability is a major factor for me) and also needed fully graded hammer action keys.My answer will only apply to you if you are looking for something under $1000, but the Kawai ES100 digital piano is SPECTACULAR. It is one of the most cost-effective pianos available out there, is portable, very sleek and can easily be accommodated in a small space, and has great hammer action and sound. They took individual samples from each of the keys, unlike other companies which simply sample an octave and adjust it across the board. Even if sound is not a factor for you, you should go for this one because it comes as close as possible to the real thing at this price, and has been cited by many to be at par with several more expensive pianos by other companies
2. Sperm on a computer keyboard?
You are sister would not get pregnant, even if she fingered herself. Although I find it curious how you know about your sister's masturbation habits. Let us suppose the following worst case scenario possible. Let's supposed all of your ejaculate went all over the keyboard and no square inch was spared from saturation. Before you had any chance to clean up, your sister rushed in and threw you out so she can use the computer. She was in such a rush that she did not even notice you with your pants down and simply started using the keyboard immediately. She soon finds her hands wet and sticky from all your ejaculate and thinks this feels gross. But on the way to the bathroom to wash her hands, she decides to immediately masturbate instead prior to washing her hands. She then breaks away from all previous masturbation habits that were discussed with you and decides to penetrate herself with the fingers of her unwashed hands. Even in this worst case scenario, the chances of her pregnancy are so extremely close to zero. A couple having sex using a condom has a better chance of getting pregnant than your sister in this worst case scenario. In the scenario that you described, the chances are absolutely zero. So congratulations! You are not the baby daddy! BTW, please clean the keyboard after you are done for all future episodes. Just a common courtesy for your family living with you.
3. What are the similarities and differences of a computer keyboard and a typewriter keyboard?
Electric typewriter and computer - a few different keys. Manual typewriter and computer - the computer keyboard is electrical switches, the typewriter keyboard is levers.
4. How does plaintext code make a computer perform certain tasks? How is the physical connection achieved between software and hardware?
Plaintext code goes through several process and ultimately is converted to binary numbers (just 0 and 1's).These binary code is broken into chunks and they are feed to the computer (think like a crank music box) witch depending on the values can do several things:Store or retrieve data from memoryInput and output operationsMath operationsInput/Output is connected thru several layers witch are very complex to the screen, hard drive, keyboard, etc and voila!