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The narrator writes to an electronic blackboard during a recorded lecture. Khan Academy offers classes with educational videos hosted on YouTube . The website is meant to be used as a supplement to the videos, because it includes other features such as progress tracking, practice exercises, [ 20 ] and teaching tools. [ 21 ]
Here’s the good news: Learning to make a sincere apology isn’t as difficult as it might sound, and we’re here to guide you through the process. The 8 tips below will help you craft a natural ...
The final option is to start a discussion about the state of the article, and get other contributors' opinions on whether it should be removed. In order to do this, you have to be a logged-in user; log in or create an account first if necessary. First, add the text {{subst:afd}} to the top of the article, and save the page. This adds a deletion ...
A blackboard-system application consists of three major components The software specialist modules, which are called knowledge sources (KSs).Like the human experts at a blackboard, each knowledge source provides specific expertise needed by the application.
A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
The red links one would thus create for any page that is not an encyclopedia article must start with the namespace prefix. For example, to create a proposed article in the Draft namespace, it would be created via a red link to [[Draft:Proposed Title]].
[1] [14] In 1998, Blackboard LLC merged with CourseInfo LLC, an online learning software company developed by Cornell University students Stephen Gilfus and Daniel Cane, to create Blackboard Inc. [12] [13] [15] CourseInfo had already developed a product and found a market fit by selling to 15 premier institutions. The company renamed CourseInfo ...
where the variables refer to Friedmann–Einstein universe, where is defined in the equations, is the speed of light, is the scale factor, is the radius of the universe (measured in light years) and its maximal value, is the mean density of matter, is time and the age of the universe (last line, measured in years), and is the Einstein's gravitational constant.