The macula is the small part of the retina that allows you to see fine details in color. Macular degeneration causes a blank spot in the middle of your visual field. As the condition worsens, you lose your ability to read or see faces. There is no cure for this affliction but there is hope for one in the future.
What is pH Litmus Paper?
Litmus paper is the most basic way you can test if a liquid is acidic (pH<7) or basic/alkaline (pH>7). Blue litmus paper turns red in acid and red litmus turns blue in alkaline. What could be simpler? It turns out there’s more to it than you thought.
What is Ammonia?
Ammonia is a simple inorganic molecule with the formula NH3. It has many important industrial and agricultural uses. Ammonia’s low molecular weight (17.031 vs water 18.01528) it useful a tool compound but is also toxic. Two simple and inexpensive ammonia leak detection methods are discussed.
Reports that other planets may support life always refer to the presence of liquid water. What is almost never mentioned is whether these planets have a strong magnetic field protecting them. This is one of the key reasons why Earth has an atmosphere and Mars doesn’t. This feature is important and simple bar magnets can demonstrate the nature of the Earth’s magnetic field.
Norovirus, aka Norwalk, is in the news again. It’s sometimes called “stomach flu” but has nothing to do with any influenza virus. It does, however, deliver some nasty symptoms above and beyond your standard winter cold. There are no vaccines or antibiotics that can prevent or relieve symptoms but you can reduce your chances of catching it.
Chlorine bleach is an inexpensive and widely used chemical for sanitizing and disinfecting in restaurants, daycare and hospitals. The recommended concentrations for these can vary by as much as a factor of 50!. Unfortunately, the labels on off the shelf supermarket products are of little use when trying to dilute bleach correctly for most of these uses.