The criterion level, often abbreviated as Lc, is the steady noise level permitted for a full eight-hour work shift. This is 85 dB(A) in most jurisdictions, but it is 90 dB(A) in Quebec and 87 dB(A) for organizations that follow the Canadian federal noise regulations.
Royal Catchfly (Silene regia) This striking plant may grow as high as five feet, with bright red flowers. It flowers from May through September, and can be seen in remnant prairies and open woods. In Missouri, it is known only in the Ozarks.
CHAPINGO, Mexico â At this time of year, when corn grows high, some farmers go into their fields hoping that a disease has infected their crops. They inspect for swollen husks, a telltale sign that a parasitic fungus has spread into a spongy iridescent mass inside the ears.