Under Perens' definition, open source describes a broad general type of software license that makes source code available to the general public with relaxed or non-existent copyright restrictions.
1 Illnesses such as the flu or colds. Home treatment of your flu and cold symptoms usually will relieve lightheadedness. 2  Vomiting, diarrhea, fevers, and other illnesses that cause dehydration.  Very deep or rapid breathing (hyperventilation).
Lightheadedness usually is not a cause for concern unless it is severe, does not go away, or occurs with other symptoms such as an irregular heartbeat or fainting. Lightheadedness can lead to falls and other injuries. Protect yourself from injury if you feel lightheaded: Lie down for a minute or two.