Scab, a plant disease; also, the roughened crustlike area on the plant surface resulting from the disease. The disease is caused by various parasitic fungi, each of which usually infects only one kind of plant. Agricultural commodities susceptible to the disease include apples, avocados, barley, cucumbers, peaches, pecans, potatoes, and wheat. Spraying with fungicides and the use of disease-resistant varieties are common methods of prevention and control, but scab is difficult to control once it has taken hold.
When a star dies, it becomes a black hole. Once something passes through the it's gone for good, never to be seen or heard from again. If we lived next to a black hole, would it suck us in too?
We hear about humidity in just about every weather report on the nightly news. There are several different ways meteorologists measure humidity, but relative humidity is the most common measurement. What is relative humidity, though? Find out in this