Search results for “classification”

08 Classification of Substances

In chemistry, substances are divided into different groups. This screencast gives a short and theoretical overview of this classification. An initial relationship between elements and compounds is essential. Original: "Wolfgang Dukorn" Original: German. All translations in this video have been don

How did clouds get their names? - Richard Hamblyn

View full lesson: http://ed.ted.com/lessons/how-did-clouds-get-their-names-richard-hamblyn The study of clouds has always been a daydreamer’s science, aptly founded by a thoughtful young man whose favorite activity was staring out of the window at the sky. Richard Hamblyn tells the history of Luke

7 Signs It is Not Depression, But Sadness

Major depression or clinical depression is when you're depressed on most days, losing interest in normal activities and relationships, for at least 2 weeks or more. Major depression include depressive symptoms like fatigue, feelings of worthlessness, impaired concentration, insomnia or hypersomnia,

Can using your cell phone give you brain cancer?

Is using a cell phone harmful to your health? In the first of a two-parter, Risk Bites looks at the chances of your cell phone giving you brain cancer (spoiler alert: not a lot). Next time -- the more worrisome risk of your phone placing you in a life or death situation. Note: The video refers t

OCD

Obsessive-compulsive disorder (OCD) is a disorder in which a person has unwanted intrusive and repetitive thoughts that become obsessions. These obsessions cause sufferers to do things to alleviate thoughts, a behavior called compulsion. Since these learned rituals only provide temporary relief, the