Q: You can use sheet metal shears to do this easily. Make the sheets the same size. You want 1 sheet to fit on your burner or hot plate, and both to fit in the 2-liter bottle. Making them both 6 in (15 cm) squares should work well. Use a degreaser to remove any oils or grease from your copper sheet. You do not want them to react with the copper or to prevent oxidation from happening. You should also wear gloves to avoid getting oil from your skin on the copper. Also be sure to scrub the copper with steel wool or sandpaper to remove any corrosion. Once you have placed a sheet on the hot plate, turn the hot plate on. This will heat the copper and provide the energy needed for the copper to react quickly with the oxygen in the air. This speeds up the natural oxidation process considerably. As the copper heats up you will see varying shades of red, pink, purple, and possibly other colors. This is a sign that oxidation is taking place. Finally, you will notice that these colors are all being replaced by a black covering. This covering is cuprous oxide. Once the whole sheet is covered in cuprous oxide, allow it to cook at least 30 more minutes. Cooking the extra 30 minutes makes the cuprous oxide layer thick and brittle. This allows it to break away from the copper. A thin layer of cuprous oxide would remain on the copper, covering up the cupric oxide layer that needs to be exposed. When you are finished cooking the copper, turn the burner off. Leave the copper on the burner to cool. This allows the copper to cool very slowly to room temperature, which should take about 20 minutes. During the cooling process the copper and the cuprous oxide layer shrink at different rates. As long as the layer is thick enough, this will result in the black cuprous oxide flaking off and exposing the red cupric oxide layer.  Note that cupric oxide (Copper (II) oxide) is the fully oxidized form, and cuprous oxide (Cu2O) is still in an active state. You can rinse the sheet under water to remove the remaining black deposits. Cupric oxide is a semiconductor and must be exposed in order to make the solar cell function.
A: Cut 2 copper sheets. Clean your copper sheets. Place 1 copper sheet on a hot plate. Allow the copper to oxidize completely. Allow the copper to cool slowly.

Q: Color-correcting concealers help to mask skin discoloration by bringing problem areas to a more neutral hue. When picking concealers, an understanding of color theory will be helpful.  Complementary colors are colors that are completely opposite each other on the color wheel. The following are the pairs of basic complementary colors you'll use for color correcting: red with green, yellow with purple, and blue with orange. For most types of color correcting, makeup of one color will cancel out discoloration of its complement. The exact opposite color can also sometimes overcorrect, making skin look lifeless and unnatural. In these instances, you should use a color next to the discoloration's complement. Most color-correcting concealers come in a single shade. The exceptions are oranges and peaches. For these, select deeper shades if you have a darker skin tone and pastel shades if you have a lighter skin tone. A normal skin tone concealer is usually used over color-correcting concealers. Green is the color opposite red on the color wheel and is therefore the strongest color for canceling out red. Because of this, green color-correcting concealers are best for neutralizing intensely red blemishes. Most green color correctors are a pastel mint color.  Use green concealers directly on small patches of red like pimples. Green concealers are also good for medium-sized areas of redness, such as moderate acne and irritation. For people with fair skin, a common pattern for placing green concealer is down the front of the nose, the center of the forehead, around the nostrils, and along the cheekbones. For more diffuse areas of vivid redness that cover most of your face, like sunburn or rosacea, consider using a green-tinted makeup primer instead. A tinted primer will work the same way as a color-correcting concealer but will even out your tone for a flawless foundation application. Sometimes green concealers work too well, making the skin look dull and lifeless. By instead selecting yellow, a warm color next to green on the color wheel, you can tone down red discoloration without removing all traces completely.  Yellow concealers are a good choice for masking mild to moderate diffuse redness.  Yellow concealers are also great for neutralizing and brightening dark purple and blue blemishes like fresh bruises, age spots, sun spots, and dark under eye circles on some people. If this is your first time using a particular skin tone concealer or foundation, check to see how you look wearing them without additional color correction first. Many concealers and foundations for lighter skin tones have some degree of yellow pigment for built-in color correction. If you have darker skin, orange can be used as a catch-all color corrector for many different types of discoloration, from acne scars to hyperpigmentation around the lips.  You can also apply orange to the entire face for a radiant effect. When using orange as a whole-face product, consider using a dusting of orange powder or tinted primer instead of concealer.  Orange is also the color of choice for correcting blue-toned under eye circles on medium to dark skin. If you have darker skin that has a lot of natural variation in shade, it's best to also use two or more different oranges for color correcting. Use a deeper orange on darker areas of skin and a paler orange on the lighter spots. If you have lighter skin, you may choose to use orange concealer as a bronzer for contouring instead of color correcting. Orange is generally too bold to work as a color corrector on light skin, but you can brighten the area under your eyes with a light salmon color-correcting concealer.
A: Understand how color-correcting concealers work. Spot treat extremely red areas with green. Add a layer of yellow to even out a ruddy complexion. Use bright orange on darker skin tones.

Q: (note: place butter in a microwave for 20 seconds to melt it), 2 cups of sugar, 2 teaspoons of vanilla extract, 4 eggs, 3 tablespoons of peanut butter, and 3 tablespoons of Nutella together in a separate bowl. (The Nutella and peanut butter should also be melted down in the microwave for about 20 seconds.) Once mixed, place into a baking pan. Allow to cool and then enjoy!
A:
Preheat oven to 350℉ (175℃). Sift together 1 cup of flour, ¾ cup of cocoa powder, ½ teaspoon of baking powder, and ⅛ teaspoon of salt in a bowl. Blend the butter. Mix the two bowls of ingredients together using a whisk or electric whisk. Place in oven for 30 minutes. Finished.