Month: April 2014

Barometer question

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Measure the height of a tall building using a barometer The following concerns a question in a physics degree exam at the University of Copenhagen: "Describe how to determine the height of a skyscraper with a barometer." One student replied: "You tie a long piece of string to the neck of the barometer, then lower ... Read more

Open Source

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Open Source Freedoms: freedom to use freedom to modify freedom to share freedom to share your changes So that means that you may use Open-source software and submit your updates to it. And you may fork it and change something different if you need to. What can you get from Open Source Projects? Valuable experience Community ... Read more

copyright

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Copying Isn't Theft (by Nina Paley) The state of the music industry How Copyright Protection Makes Books Vanish The above chart shows a distribution of 2500 newly printed fiction books selected at random from Amazon's warehouses. What's so crazy is that there are just as many from the last decade as from the decade between ... Read more

cryptography

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Public Key Cryptography: Diffie-Hellman Key Exchange The idea here is that (3^24 mod 17) ^ 54 mod 17 = 3^(24*54) mod 17 = 3^(54*24) mod 17 = (3^54 mod 17) ^ 24 mod 17. Alice has result of (3^24 mod 17) from Bob and her private number 54, while Bob has result of (3^54 mod ... Read more