You have two kidneys, each about the size of a fist, located on either side of the spine at the bottom of the rib cage. Each kidney contains about one million functioning units called nephrons. A nephron consists of a filtering unit of tiny blood vessels, called a glomerulus, which is attached to a tubule. When blood enters the glomerulus, it is filtered and the remaining fluid then passes through the tubule.
In the first case, each time the computer starts up, the question mark appears and flashes for a few seconds, then disappears. The cause of this symptom is that there is no hard drive selected in the Startup control panel. Remember that selected on the Macintosh means that an icon is darker than the other.
Scientists find blinking eyes mean the mind is wandering. Ever get the feeling that the person youâre talking to isnât being entirely attentive? Now you can tell for certain â because scientists have found a way to prove whether someone is listening to you. All it takes is a look into their eyes. When a person blinks, it is a sign that their mind is wandering, a study shows. The researchers think that blinking sets up tiny physical barriers that help to shut off the outside world.