Type "chflags hidden" then drag the file or folder that you want to hide into the terminal. The location of the file will be entered in after the command you typed. Press return to hide the file. To unhide the file, type "chflags unhidden <file name and location>" into the Terminal. You must specific the location of the file as well as its name and extension. If hidden files are set to be viewable, then you can drag the file as you did in the first step. To see hidden files in the Finder, open the terminal and type "defaults write com.apple.Finder AppleShowAllFiles TRUE." This will make all files visible. To set hidden folders back to invisible, type "defaults write com.apple.Finder AppleShowAllFiles FALSE." You can make a file or folder invisible in Mac or Linux by adding a "." to the front of a filename. In the terminal type mv sample.txt .sample.txt. This will rename the file so that it cannot be seen.

Summary: Open Terminal. Unhide the file. Show hidden files.

Before you do anything to your tank, you must unplug the heater and turn off the filter and pump. Don't worry, the cleaning process is quick, so your fish will be fine. Do not remove your fish, decorations, or plants from the tank. There are two tools aquarium hobbyists will use for cleaning their gravel. Aquarium siphons usually have a thick, plastic tube or "siphon" with a thin, flexible, tube attached to one end. Some of these may have a priming ball attached to one end. Plastic, flexible tubes can also be used to clean gravel. These are ideal for smaller tanks. The bucket must be beneath the water level. It will catch the old water. Slowly lower the entire siphon into the tank so that all of the air gets out of the tube. Cover the end of the tube with your thumb and take it out of the tank; keep the other, open, end submerged. Place the covered end in a bucket. If you release your thumb, the water will begin to flow; if you cover the end again with your thumb, the water will stop. Some aquarium vacuums come with a rubber ball attached to the end of the siphon. Stick the end of the siphon into the aquarium and lower the end of the tube into a bucket. Plug the end of the tube with your finger, and squeeze on the priming ball. Slowly let go of the ball, but keep the end of the tube plugged. Water will begin to fill the siphon, sort of like an eyedropper or turkey baster. When you unplug the end of the tube, water will start to flow into the bucket. These types of gravel vacuums are different from all others. They do not require a bucket. Instead, they need to be hooked up to a water faucet. Simply plug the end of the Python vacuum to your water faucet and place the entire vacuum into the aquarium. When you turn the faucet on, the vacuum will begin to siphon.

Summary: Unplug the heater, filter, and pump. Get out your aquarium vacuum. Place a bucket below the aquarium. Start the vacuum by submerging it. Start the vacuum with a priming ball. Know how to start up a Python, and other similar types of vacuums, if you are using one.

Before you even get on the machine you should have an idea of what you want to accomplish for that day. Just hopping on the elliptical and moving is not the most effective or efficient way to workout. Make sure you have an idea of the time you plan to spend on the machine and the level of workout you intend to get. Most ellipticals will have a digital monitor. Before you start your workout, locate the incline buttons and figure out how to adjust the resistance. Some ellipticals have a sticker or other label on them with instructions about how to get the machine started. Each machine is a little different so take the time to get comfortable using the console before starting your workout. If you are at the gym they may have their own instructions posted with additional information. You can also ask one of the trainers to help you get set up. Most elliptical machines will allow you to put in your weight and age. This way the machine can help you track how many calories you've burned during your workout. The handles on some elliptical machines will have sensors on them that can monitor your heart rate as well. Some machines will allow you to plan a workout by adding some additional info including how many calories you want to burn, how long you would like to workout, or what intensity level you are aiming for. For a moderate workout, your heart rate should be 50 to 70 percent of your maximum heart rate. For a vigorous workout you're aiming more for 70 to 85 percent. To calculate your max heart rate subtract your age from 220. If you are 31 you max heart rate is 189. Changing the incline angle of the machine can have a great effect on the intensity of your workout. Keeping the machine at low incline will give you a workout more akin to cross country skiing. A medium incline is more like a bike or spin class, and a high incline will be more like climbing stairs. You can adjust the settings throughout to give your workout variety and help you focus on different muscles.

Summary: Set a goal for your time on the elliptical. Take a moment to familiarize yourself with the console. Program in your weight and age. Get comfortable adjusting the incline level.

at a local pool or friend's house. During summer, one of the best activities to do with friends is to go swimming. You can also swim in lakes or rivers if you live near them. While you are swimming, play pool games like sharks and minnows or Marco Polo. Have diving or cannonball contests. Bowling alleys are great places to hang out at any time of year with your friends. You can even create fun names for your bowling teams. Arcades are fun places to go with your friends, as they have games for everyone. Challenge your friends to see who can do best at each game. If you're at an arcade where you can win tickets, pool your tickets together when you are finished playing so you can get a better prize. Going to see a new movie in theatres is a great way to hang out with friends. Pick a movie that you all want to see. If you can, try to go to a matinee showing of the movie. They are cheaper, and there will be fewer people in the theatre. Bring a bag with your own snacks, as movie theatre snacks can get expensive. If you want to buy snacks, share a large popcorn with your friends to make it more affordable. It can be fun to plan in advance to attend these types of events with your friends. Look in local newspapers and online to see the schedule of events for the next few months in your city.
Summary: Go swimming Go bowling with your friends. Check out local arcades. Watch a movie. Look into local festivals and concerts.