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2. Einstein's Blackboard - Wikipedia

   en.wikipedia.org/wiki/Einstein's_blackboard

   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.

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   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

4. Khan Academy - Wikipedia

   en.wikipedia.org/wiki/Khan_Academy

   Khan Academy is an American non-profit [3] educational organization created in 2006 by Sal Khan. [1] Its goal is to create a set of online tools that help educate students. [4] The organization produces short video lessons. [5] Its website also includes supplementary practice exercises and materials for educators.

5. Buy Viagra and Sildenafil Online in 2024 - Healthline

   www.healthline.com/health/mens-health/viagra-online

   If you want to make changes to your order, Roman offers free unlimited follow-ups with its online medical professionals. Cost: Branded Viagra costs $90 per dose. Sildenafil is also available ...

6. Sketch (software) - Wikipedia

   en.wikipedia.org/wiki/Sketch_(software)

   Sketch is a vector graphics editor for macOS developed by the Dutch company Sketch B.V. (formerly named Bohemian Coding). It was first released on 7 September 2010 [2] and won an Apple Design Award in 2012. [3]

7. Games and applications for Windows Live Messenger - Wikipedia

   en.wikipedia.org/wiki/Games_and_applications_for...

   Whiteboard opens up a program that looks like Microsoft Paint, but it is shared through two users. They can see what each other draws. This Whiteboard also supports different pages, to allow drawing across many different pages. It is not compatible with Windows Vista. See Whiteboarding.