Problem: Article: Vitamin C starts to degrade as soon as it comes into contact with water. This process can be slowed down by the addition of preservatives, but the balance must be precise and the formula will still have a shorter shelf life than a formula which does not use water. Look for serums made with ascorbic acid (AA), tetrahexyldecyl ascorbate (THDA), magnesium ascorbyl phosphate (MAP), or sodium ascorbyl phosphate (SAP). The most common form of vitamin C in skincare is L-ascorbic acid. Unfortunately, this is also one of the least stable forms of the vitamin. Other forms may offer less potency, but increased shelf stability. Look for formulas made with ascorbyl glucoside, magnesium ascorbyl phosphate, and tetrahexyldecyl ascorbate. The more your serum is exposed to light and air, the faster it will break down. If you purchase a vitamin C serum in a transparent bottle or a tube which is not airtight, it will probably lose its potency before you can use it all. If you can only find transparent bottles, transfer your new serum to an opaque bottle after you get home. To avoid wasting large amounts of serum, try purchasing smaller bottles. You can also check to see if you can find sample sizes of a serum you want to try so you don’t spend a lot of money on a product that will go bad before you use it all. Since vitamin C serum expires after a few months, only buy what you think will use before the expiration date.
Summary: Avoid choosing a serum which uses water, as it will break down faster. Choose less powerful but more stable forms of vitamin C. Look for a serum in an opaque, airtight tube or bottle. Purchase small bottles of vitamin C serum so you don’t waste any.

INPUT ARTICLE: Article: Using a soft-bristled toothbrush, brush the speaker ports.  This gentle motion should clean grime and gunk off the speakers. You could dip the very tips of the toothbrush bristles in rubbing alcohol for added effect.  Don’t dip the whole brush in. Painter’s tape is a blue tape used when painting walls.  It has a pressure-sensitive adhesive, which makes it perfect for cleaning iPhone speakers.  Tear a short piece off and roll it into a cylinder with the sticky side facing out.  The cylinder should have a diameter about the width of your index finger. Slip the tape over your index finger, then press it onto your iPhone speaker. The tape should pick up all the grime and bits that have accumulated in the speakers. Check the surface of the tape after each application.  If you see lint and grime stuck to it, remove and discard the used tape, roll another small cylinder, and repeat. Use compressed air to blow lint and dust out of your speakers.  Compressed air is canned oxygen, and is often used to clean computers and electronics.  To get started, lay your phone flat with the screen down.  Read the directions on the can before using it.  Always use canned air as directed. Aim the canned air nozzle at the speaker from whatever distance the can’s directions suggest. Squeeze the can’s handle briefly, then release.

SUMMARY: Scrub the speakers. Use painter’s tape. Blow debris out of the speaker.

In one sentence, describe what the following article is about: If there is more than one entrance to a room, make sure that there is a clear and fairly straight path between them (it can "arc" around a seating area if necessary). This can also help divide a space and make sure each entrance has an open area facing it. Think about how someone would need to move through a room. The consider where your furniture is. Is something going to get in the way? Make it difficult to get from one area to the next? Make sure these barriers are moved or at least broken up. Not only do you want to be able to sit down on your couch easily, you also want to be able to reach things like outlets easily. Have at least one easily reachable with a nearby, low table. This will allow you a space to charge electronics, like phones and portable media devices. You can also use furniture to break up large spaces, although this should be considered earlier on in the process. If you have a very large, open room, it will be better to use the furniture to break the space up into sections. For example, use the backs of couches in place of walls to create a living room and make the space on the other side the dining area.
Summary: Leave a pathway between entrances. Avoid blockading paths. Make sure all furniture and outlets are easily accessible. Separate spaces.

In one sentence, describe what the following article is about: Slide the clamps closed and push the extension rod in all the way. Then, hit reset to display only zeros on the screen. Properly zeroed calipers are essential to getting an accurate measurement, so make sure to do this! Calipers have 2 large jaws that you can open and close around the outside of an object. These jaws are located at the bottom of the ruler part of the calipers. Open the calipers so they are wider than the outside of the object, and then close the calipers around the part of the object you want to measure. For example, to measure the length of a nail, open the calipers wider than the length of the nail and close them so that 1 jaw is touching the head of the screw and the other is against the pointed end of the screw. Find the inner measurement jaws on top of the calipers (above the part that looks like a ruler). These are smaller than the outer jaws. Close the inner jaws of the calipers and put them inside of the object. Open the calipers so the inner jaws are pressed against the inside of the object. For example, to measure the inner diameter of a pipe, open the calipers until they are pressed against the inside of the pipe to get your measurement. Locate the extension rod on the side (or end of the ruler section) of the calipers. Position the calipers against the top edge of the object or hole, and then extend the bar down into the hole or object until it touches the bottom. For example, to measure the depth of a hole, place the caliper jaws against the rim of the hole and extend the bar down into the hole all the way to the bottom. Look at the screen and record the number. Keep in mind that the readout will include a zero or whole number followed by a decimal and 3 digits behind it.  For example, the readout may say 0.365 in (0.93 cm) or 4.987 in (12.67 cm). Record the entire number as your measurement. Some digital calipers have a button to change the measurement from imperial to metric or vice versa. Check to see if this is a feature of your calipers and press the button if needed.
Summary:
Zero out the calipers before you get started. Clamp the jaws around the outside of the object for an external measurement. Open the jaws inside of an object to find the inner diameter. Push the extension rod into the object for a depth measurement. Look at the digital reading.