curiosity

The Opportunity Marathon – 42 KM and 11 years in a timelapse of 8 minutes

To celebrate the work of the Opportunity rover on Mars, NASA has released an 8-minute time-lapse video of the 42 kilometres travelled in 11 years.         Eight breathtaking minutes with the photos taken by the hazcam on the left side and the map of the winding route followed by the small rover on the right.  The audio […]

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What are symbolic links between folders and how to use them to increase space on your OS HDD

When we install a large program on Windows, links are created in the registry that help keep track of the real location of the executable files.  For this reason, if we move a program to a secondary partition, it will stop working (the links will stop running).    How do you ensure the continuity of

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How to calculate hash MD5-SHA1-SHA-256-CRC32 in Windows Linux Mac and online

What they are  Hash are used in computer science to map a string (a sequence of bits) of arbitrary length into a string of predefined length.  It is a sort of ‘signature’ of an electronic document. For each string you can calculate a hash, so each different string will have different hashes.  However, calculating the

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RAR5 vs RAR4 vs 7ZIP – A quick comparison

Better. zip .7z or .rar?  Often we don’t even pay attention to it, but when we click on a ‘zipper’ file, we are using sophisticated compression algorithms that over the years keep getting better and better.   There are many algorithms and therefore compression formats:  Zipper, Rar, GZip, BZip2, 7z, Tar, Tar.gz …   Among the most popular on Windows we have: 7z, Zip and Rar.  The first and the second one

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How the Windows password works and why when we type a wrong one it takes more time to login

It may have happened that you entered the wrong password on Windows (XP/7/8/10…) and noticed that the computer took longer to retry the input field.  Many will have wondered why when you enter the correct password the PC recognizes it immediately, while it remains in a sort of semi-stall otherwise.   Some may have thought that

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The 17 equations that have changed the World

An interesting collection made by Ian Stewart, British mathematician and writer.  From Pythagoras’ theorem, passing through Euler and Fourier, to Maxwell, Einstein, and Shannon; all the greatest discoveries are listed in chronological order.  But what can I say? in my opinion there is room for at least another dozen equations, in any case you can see his list in the picture below. 

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