The ENIAC was invented by J. Presper Eckert and John Mauchly at the University of Pennsylvania and began construction in 1943 and was not completed untill 1946. It occupied about 1,800 square feet and used about 18,000 vacuum tubes, weighing almost 50 tons.
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They allow you to ask more questions and also your rank goes up or down.
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Answer:
This is because the other person has "Focus Mode" turned on. When this is turned on, all of your messages that you send to him/her will be silenced.
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Five of the main design principles are legibility, visual contrast, figure-ground organization, hierarchical organization, and balance. Together these principles form a system for seeing and understanding the relative importance of the content in the map and on the page.
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