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529. Why The Time is Always Set To 9:41 In Apple Ads?

That time used to be 9:42 . You could see it across various commercials, print ads, and even on Apple's site itself. The explanation was simple: That's the time in the morning that Steve Jobs announced the very first iPhone in 2007. Around 42 minutes into his keynote address, he said, "Today Apple is going to reinvent the phone."
And a picture of the iPhone, displaying the time 9:42, popped up on the screen behind him.
But that all changed in 2010, when the very first iPad was released. When that was revealed, it displayed a different time: 9:41. The time was changed for no reason at all.
 
528. What is Litmus Paper, how does it work ?

Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutral litmus paper is purple. Litmus can also be prepared as an aqueous solution that functions similarly.
The primary raw materials used for making litmus paper are wood cellulose, lichens, and adjunct compounds. Litmus paper, as its name implies, is primarily composed of paper. The paper used to make litmus paper must be free of contaminants that could change the pH of the system it is measuring.
 
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