You may want to buy a used Apple computer in decent physical condition that is not currently in disrepair, and that does not contain excessive signs of wear. If you are buying a laptop, examine the keys and trackpad for signs of fading or rubbed away letters, numbers, and symbols, which can indicate excessive use. You may not want to purchase a used Apple computer running on an outdated operating system, unless it has enough memory to support an upgraded operating system. If upgrading the operating system is required, verify that the computer's hardware can handle the upgrade in terms of memory and processing speed. For example, if at least 2 additional gigabytes (GB) of memory are required to run a newer operating system, verify that you can install at least 2 GB of memory on the machine. The installation disc is necessary if for some reason you need to reinstall the Apple's operating system and software. Although refurbished computers may have been returned to the manufacturer at one point, Apple technicians have either repaired the computers, replaced non-working parts, or upgraded the computer to return it to a fully operational state. You may want to buy a used computer that has only had 1 previous owner, or that has not been moved frequently between locations. There may be no issues with the computer if the owner is upgrading to a newer model; however, if they are selling the computer because it frequently experienced issues, you may not want to buy that particular computer.
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One-sentence summary -- Examine the physical state of the computer's hardware. Determine the version of the operating system currently installed on the computer. Verify that an installation disc is provided with the used Apple computer. Look specifically for a refurbished Apple computer. Determine the history of the used computer. Ask the current owner why they are selling the computer.

Most growing house geckos do not enjoy being picked up and held. Handling your gecko may also prevent him from getting used to his new environment. House geckos are fragile and if you pull on their tail, they may lose their tail or become injured. You may want to wait until your gecko is an adult to handle him outside of his cage. Even then, you should be careful when handling him and try not to let him out of your hands as house geckos can move very fast and tend to hide in hard to reach places once they are out of their tanks. Lifting your gecko from his underbelly will spook him and cause him to jump out of your hands. Make sure you pick him up from the top of his body and get a good grip on him before you lift him out of his tank. You may then cup him in your hands to ensure he does not run away. In general, you should only handle your gecko if you need to remove him to clean the tank. Wash your hands before and after handling your gecko, as you may have bacteria on your hands that can cause illness. Your house gecko will shed his skin in patches every four to six weeks. He may turn a dull color and the skin over his eyelids may pop as he sheds his skin. Though the shedding can look uncomfortable, do not try to peel off the skin from him as this can be painful and dangerous for your gecko. If the tank conditions are humid enough, your gecko should be able to shed his skin on his own and he may even eat his own shedded skin. During the shedding process, your gecko will grow a new layer of skin and it will separate from the old layer, creating a fluid between the two layers. If your gecko's enclosure is too dry, the fluid will not form properly and make it more difficult for your gecko to shed his old skin. If your gecko's old skin does not seem to be coming off on its own, you may need to adjust the humidity of your tank by misting the tank twice a day. You may also provide a moist box in his tank, such as a plastic container filled with moist reptile terrarium moss. Cut a door into the side of the container and place the lid on the container. This will allow your gecko to go into the box at his will. If your gecko has trouble getting old skin off his toes, tail, or head, you can assist him by spraying the area with water and gently massaging the skin until it peels off on its own.
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One-sentence summary -- Handle your gecko when it has reached adulthood. Never pick up your gecko from his underbelly. Allow your gecko to shed his skin on his own.

Hammer-ons and pull-offs are two essential techniques to use if you're soloing on guitar. With a hammer-on, you basically tap the string with your finger on a higher fret to play another note without strumming. A pull-off is the reverse, when you remove a finger on a higher fret so that the string plays a lower note. When done correctly, the 2 notes slur together, creating a smoother sound. And since you don't have to strum each note separately, you can play much faster. Combine the techniques and go back and forth between 2 notes for several beats to create a sort of trill in your solo. This works well at the end of phrases. It's commonly understood that lead guitarists play single notes rather than chords but there's no rule that says you can never play a chord just because you're the lead guitarist. Use chords to add body to root notes in your solo or emphasize a particular phrase. For example, if you used whole notes to build the basic outline of the structure of your solo, you could play some or all of those notes as chords, then fill in with single notes in between. To bend a string, fret it with 2 fingers and pull it across the fingerboard. As the string gets tighter, the pitch will go up. Pull from your wrist to bend the string, using your fingers as levers. This puts less pressure on your fingers and wrist by distributing the effort. Don't try to bend a string if it's not in tune. You could break the string. If you've never bent strings before, it's a technique that will take some practice to get right. Play the note you want to bend, then the note you want to bend the string to. That way you'll know when you've bent it far enough. Vibrato is a technique similar to string bending, except that you gently move the string up and down for a slight variation in pitch. Lock your fretting finger against the neck of your guitar to get a good pivot point, then wobble that finger up and down after strumming the note. Vibrato is more difficult on the outside strings, since you don't want to pull the strings off the side of the neck. Experiment with your vibrato, doing it at different speeds and bending the string at different distances. A small, slow vibrato is typically more appropriate for ballads while bending the string further and faster works well with rock songs. Listen to guitarists you admire and watch their solo technique. If you see something you like, practice it and try to emulate it. The same goes for motifs or riffs that capture your attention. Simply copying others won't make you a great guitarist. Once you've learned how to emulate someone else's idea, play around with it and try to make it your own. All guitarists have influences, but the greatest have a signature style that builds on their influences rather than mimicking them.
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One-sentence summary --
Use hammer-ons and pull-offs to play notes faster. Mix in chords to bring power and drama to your solo. Bend strings at the end of phrases. Use vibrato to add emotion to your solo. Throw in ideas borrowed from other guitarists.