The Curated Internet

One of the easiest way to visualize fluid phenomenon is by placing your fluid on top of a bright striped background. And by measuring the deviations of this striped pattern, it is possible to infer a lot of sensible data such as the changes in density of the fluid and so on.  In this post, this technique is demonstrated in water using an alternating red-black striped pattern as the background. If the region of interest is only the surface on the other hand, the bright striped pattern can be made to reflect off the top of the fluid surface. We demonstrated this technique in our ‘Water is diamagnetic: A simple experiment’ post which you can check out here [broken link].

  "sunspots do not appear at random over the surface of the sun but are concentrated in two latitude bands on either side of the equator. A butterfly diagram (figure attached below) shows the positions of the spots for each rotation of the sun since May 1874 shows that these bands first form at mid-latitudes, widen, and then move toward the equator as each cycle progresses"   -https://solarscience.msfc.nasa.gov/SunspotCycle.shtml 

  https://www.nasa.gov/mission_pages/station/expeditions/expedition30/tryanny.html Here the approximate cost in energy has been given in terms of velocity (kilometers per second, km/s), a common ploy engineers use to simplify the discussion. These numbers assume ideal conditions such as no losses for atmospheric drag or combustion but are close enough for the sake of this illustration.    

 

It took me a whole hour to figure how to set up a .desktop file on Ubuntu which honestly seems unnecessarily complicated. In previous versions of Ubuntu, there was a GUI (gnome-desktop-item-edit) which aided in this process but unfortunately, this appears to have been removed. Here are some useful notes to set up .desktop files .desktop file format example #!/usr/bin/env xdg-open [Desktop Entry] Version=1.0 Type=Application Terminal=false Exec=/usr/bin/gedit %U Name=Test_1 Comment=comment here Icon= What's the %U in the Exec file? It's a parameter for the Exec key in .desktop files (defined in the Desktop Entry Specification) that describes how arguments to the program (from the file manager/program launcher, e.g. multiple selected files) should be handled Make the desktop file executable and copy it to /.local/share/applications Launching the file from the terminal gtk-launch something.desktop  

 A great tool to understand galaxy rotation curves : https://wittman.physics.ucdavis.edu/Animations/RotationCurve/index.html      

  Imagine if mathematicians were tasked with with teaching Cinderella you know you could imagine that we just say theorem -- Cinderella lived happily ever after every be done with it  you know and that totally misses the point. I mean nobody cares about the happily ever after you know they care about the story. Checkout Jim Fowler's courses on YouTube . They are truly one of a kind.  -- The humanity of calculus | Jim Fowler | TEDxColumbus