For this battery, you will need one unopened can of soda (any type will do), one plastic cup (6 to 8 ounces), and one 3/4-inch-wide strip of copper that's slightly longer than the height of the cup. In addition, you'll need a pair of scissors, a voltage meter, and two electrical lead wires with alligator clips at both ends. If you don't already have these materials around your house, you can purchase them at a hardware store. You can substitute the copper strip with several pieces of copper wire stuck together or bent in a zig-zag fashion to reach the desired width. Note that the cup doesn't absolutely have to be plastic. It just has to be non-metallic. Styrofoam and paper cups will also work. Discard (or drink) any soda that remains in the can. Turn it upside down in the sink and give it a few extra shakes to make sure that all the soda is out. Cut a 3/4-inch-wide strip from the side of the soda can. Ensure that's it's slightly longer than the plastic cup's height; if this isn't possible, don't worry you can just bend the top of the strip and let it hang over the edge of the cup and into the fluid. Instead of cutting the can, you may purchase aluminum strips from a hardware store. Aluminum foil is not an effective replacement for an aluminum strip; don't use it! You can skip this step if you bought the aluminum from a hardware store. If you cut the strip from a soda can, you'll need to sand off the coatings (i.e. paint, plastic) on both sides of the strip. Ensure that the strips do not touch each other. Place them across from each other not side by side or overlapping in the cup. Ideally you've cut the strips long enough that their tops sit above the soda, extending slightly past the rim of the cup. If the strips do not extend past the cup's rim, you can bend each strip lightly so that it hangs off the edge of the cup. Attach one lead wire to one metal strip by opening the alligator clip and closing it on the strip. Then, attach a different lead wire to the other metal strip, again using the alligator clip. Be careful not to let the alligator clips touch the soda. It doesn't matter which color of wire attaches to which strip. Following the instructions that come with your voltage meter, connect a lead wire from each metal strip to the voltage meter. The meter should read your battery's voltage at roughly 3/4 of a volt.
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One-sentence summary -- Gather your materials. Fill the plastic cup roughly 3/4 full with soda. Make sure the soda can is completely empty. Cut a strip of aluminum from the soda can. Sand the aluminum strip (optional). Place the strips into the solution. Attach lead wires to metal strips. Test the battery.

Set up a routine for feeding your guinea pig. Try to feed them at the same times in the day. Also, try to feed them in a place they feel safe, such as their cage or play area. A consistent schedule will mean that your guinea pig begins to associate you with food; this is key to forming a bond with your guinea pig. Remember that whoever feeds the guinea pig will likely be the person they bond with first. If multiple people are going to oversee feeding, give them an assigned time. You can feed them in the morning, and your daughter in the evening. Or feed the guinea pig together so it gets used to both of you. The goal of using snacks is to have the guinea pig associate you with food. This is a positive association that will help the guinea pig to feel comfortable around you. At first, just place the treats in the cage. Then after a few days, hold it in your hand and see if the guinea pig will come closer to you. If they won't come all the way, toss the food gently in their direction. Have the guinea come closer each time you offer snacks. Eventually, it will begin to take it out of your hand and will begin to feel less nervous around you. Make sure you are talking in a calm yet happy voice as you feed them. Grass, vegetables, and some fruit are all tasty treats for your guinea pig. Try foods such as cucumber, carrots, banana slices, romaine lettuce, and seedless apples. Pet stores also sell treats marketed for guinea pigs and other small animals. Make sure you read the labels first; some have a lot of high fructose corn syrup and are full of empty calories. Give all treats in moderation. Too much sugar, empty calories, or just overfeeding can cause your guinea pig to become obese. This can have serious health complications for your pet and may shorten its lifespan.
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One-sentence summary -- Be consistent about your guinea pig's feeding schedule. Use hand feeding to develop a sense of trust. Treat your guinea pigs to healthy snacks.

Ensure that you have an oven rack in the center of the oven before you turn the oven on. Leave the oven to preheat while you slice the onions. into 12 inch (1.3cm) thick slices and lay them in a cast-iron skillet. Use a yellow onion if you'd like a sweeter flavor or slice a red onion for a sharper taste. Arrange the sliced onion in a single layer in the skillet. For a more delicate flavor, use 5 shallots instead. Peel the shallots and slice each in 1/2. Then, spread them in the skillet. Put the skillet into the preheated oven and cook the links for 20 to 30 minutes. Use tongs to carefully turn each link halfway through the cooking time. When you think they're done roasting, insert an instant-read meat thermometer into a link to see if it's reached 160F (71C). The time it takes to roast the chorizo will depend on the brand and size of the links. Begin checking them after they've cooked for 20 minutes. Turn off the oven and wear oven mitts to remove the hot skillet. Transfer the chorizo links to plates and serve them with soft cheese, crusty bread, and roasted vegetables. Put leftover links in an airtight container and refrigerate them for up to 4 days.
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One-sentence summary --
Preheat the oven to 400F (204C). Cut 1 onion Roast the chorizo with onions until they reach 160F (71C). Serve the chorizo with crusty bread or roasted vegetables.