INPUT ARTICLE: Article: These low frequency hums can cause nausea, feelings of fear and even manifest shadows at the corners of your vision. These are caused by the vibrations of the infrasound, depending on the intensity of the sound wave. French robotics researcher, Vladimir Gavreau, allegedly produced such effects on himself and his fellow researchers through infrasound.  Animals can pick up infrasound in ways that humans can't. Scientists believe that this might be how many animals can sense natural disasters.  Building an infrasonic microphone. The antenna itself has to be bought, but these are easy to find at an electronics store and relatively inexpensive. Once you have the microphone, get a glass jar with the diameter of 2.25 inches (5.7 cm). Stretch a 12 inch (30.5 cm) balloon over the touch. Cut off the part of the balloon which you use to inflate it, and tape the rest tightly and without wrinkles to the jar. Tape an NdFeB type magnet of 1⁄2 inch (1.3 cm) to 1 inch (2.5 cm) diameter magnet of 5000 gauss or more (you can get this from Walmart). You will need an oscilloscope to convert the electrical signals into waveform patterns. These are more expensive, but can be found for about $45 on eBay.  Alternately, call your local university's science department and see if they have any recommendations for putting together an infrasonic microphone. Check around where the house is situated. Is there a garbage dump nearby? Sometimes methane gas can seep up through the ground, giving a smell of brimstone and bursts of fire.  Often ghost sightings are simply light bouncing off of a reflective surface in an unusual way. Human sight and senses are incredibly error prone, so it can be difficult to trust what your eyes might be telling you without serious further investigation. Often people who see "ghosts" are primed to do so because of their mental health. Before you start doing odd things to your home, seek out some professional help. This doesn't mean that you don't have a ghost, it is simply a way to rule out one outside possibility. Likewise, try to have someone confirm your experience. If you're the only one seeing or sensing anything, that's the best time to get psychiatric evaluation. If others experience the possible haunting as well, look first to other natural causes.

SUMMARY: Make sure the haunting has not been caused by infrasound. Eliminate other non-supernatural factors. Get psychiatric evaluation.


INPUT ARTICLE: Article: It’s the {"smallUrl":"https:\/\/www.wikihow.com\/images\/6\/68\/Android7settings.png","bigUrl":"\/images\/thumb\/6\/68\/Android7settings.png\/30px-Android7settings.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an Android icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} that’s typically found in the app drawer or on the home screen. You may also find it on the notifications bar. This opens a list of storage locations on your Android, such as your SD card (if you have one) and internal storage. If you don’t see this option, you may have to select your internal or removable storage first. A confirmation message will appear. You now have access to the files and folders on your Android. This option is sometimes called Misc. The selected file will open in its default app.  For example, tapping a photo will open it in your gallery or photo manager app. Certain file types, such as documents and spreadsheets, may require you to download an app for viewing.

SUMMARY: Open your Android’s Settings. Scroll down and tap Storage. Scroll down and tap Explore. Tap Explore to confirm. Tap any file to view it.


INPUT ARTICLE: Article: Click the Windows logo in the bottom-left corner of the screen. You can also press the ⊞ Win key. This folder will be near the bottom of the Start window. It should be near the top of the Windows System folder. Doing so will open Command Prompt.

SUMMARY: Open Start . Scroll down to Windows System and click it. Click  Command Prompt.


INPUT ARTICLE: Article: Continue heating the mixture until it boils. The acid mixture will bubble as you add the water and urea. Add the mixture slowly so that it doesn’t cause the acid to bubble out of its container. The water/urea mixture neutralizes the nitric acid but not hydrochloric acid in your solution. In general, you will add 1 ounce of precipitant per ounce of gold that you are refining. Avoid putting your face near the container’s opening. The smell is very strong and pungent. The acid will turn a muddy brown color, which is actually caused by the separation of the gold particles. Wait 30 minutes to allow the precipitant solution to work on the gold particles.

SUMMARY:
Heat 1 quart of water and add 1 pound of urea to the water. Gradually add the water/urea mixture to the acid. Add a selective gold precipitant to 1 quart of boiling water following the manufacturer’s instructions. Add the water/precipitant solution slowly to the acid.