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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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Solar activity in real time with SOHO (NASA ESA NOAA)

SOHO – Solar and Heliospheric Observatory EIT 304 EIT 195 EIT 171 EIT 284 LASCO C2 LASCO C3 H-Alpha H-Alpha Contrasted Nobeyama 17 GHz Magnetogram 525.02nm (Fe I) Solar X-rays Geomagnetic Field   X-Ray flux Electron flux Proton flux Magnetometer Satellite Environment   SOLAR WIND Total Electron Content (TEC) Latest 48h of photon data Solar …

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How to create a Wi-Fi hotspot in Windows 7 8 or Windows 10 in a few steps

In some situations we may have to connect to a Wifi network that is not ‘visible’ from our homes.  Especially on holiday, where we are forced to stand at the window to try to get a better signal from a public HotSpot.   How to ‘repeat’ the signal picked up outside, in our house?    We …

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The Oppurtunity 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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Restore Windows following a driver error or failed update

A brief guide to help you resuscitate your PC in case you are no longer able to start after malicious driver updates.  NOTE:  This guide also applies in the event of an error due to driver installation that is not compatible with your system.  Blue error screen: CRITICAL_SERVICE_FAILED.    If you are in the condition of not being able to …

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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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How to create a safe and easy to remember password

They say that the most used passwords are always the same (example: 123456, password, qwerty, etc. …), or in any case referable to birth dates or memorable moments of someone’s life. Well, using public characters or real places is not a good idea anyway: in fact there are some software (like John the Ripper) that are able to use huge dictionaries, …

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