Adrenal fatigue is a collection of signs and symptoms, known as a syndrome, that results when the adrenal glands function below the necessary level. Most commonly associated with intense or prolonged stress, it can also arise during or after acute or chronic infections, especially respiratory infections such as influenza, bronchitis or pneumonia.
Black holes are the strangest objects in the Universe. A black hole does not have a surface, like a planet or star. Instead, it is a region of space where matter has collapsed in on itself.
PEBCAK (problem exists between chair and keyboard) PEBCAK, one of many terms used in Internet chatting, stands for problem exists between chair and keyboard, meaning it's a problem in user understanding or behavior rather than something wrong with hardware or software. The term is sometimes used by help desk people since it's a common class of problems. There are several variations, such as PIBKAC (problem is between keyboard and chair).