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Liquid crystal display technology works by blocking light. Specifically, an LCD is made of two pieces of polarized glass (also called substrate) that contain a liquid crystal material between them. A backlight creates light that passes through the first substrate. At the same time, electrical currents cause the liquid crystal molecules to…[ 続きを読む ]

Still Confused About Masks? Here’s the Science Behind How Face Masks Prevent Coronavirus

As states reopen from stay-at-home orders, many, including California, are now requiring people to wear face coverings in most public spaces to reduce the spread of COVID-19.

Both the Centers for Disease Control and Prevention (CDC) and the W…[ 続きを読む ]

Do Air Purifiers Actually Work?

The promise of an air purifier is an enticing one: An appliance designed to cleanse the air in your home, getting rid of all the impurities including odors, smoke, dust, and pet dander. Given the fact that indoor air can have levels of certain pollutants up to five times higher than outdoor air, we get…[ 続きを読む ]

Keep in mind that not all wheelchairs are alike and that the instructions below should be useful for most manual folding wheelchairs. Your wheelchair may be different, so if you are having a hard time folding or unfolding it, please consult your doctor or local physical therapist for help.

Opening and Closing a Wheelchair…[ 続きを読む ]

Introduction to Partition Walls:

Partition Walls also called Stud Walls are unloaded walls intended to separate apart within a building, to form an interior room/cabinet, or to separate the laundry area from the rest of the building. Since partitioning walls can be loaded with a roof, therefore, they are built solely for the purpose of…[ 続きを読む ]

The subject of acoustics is regularly discussed in SOS, but plenty of readers still ask for the subject to be covered from a much more basic starting point. What follows is a look at installing acoustic treatment from a complete beginner's perspective: some basic, essential information, along with a bit of advice from acoustics…[ 続きを読む ]