Some useful vim trick

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:echo $HOME
:echo $VIM
:echo $VIMRUNTIME

It is where you can put a .vimrc (or _vimrc in Windows)

Learn about this from a

http://bugs.python.org/issue12459

When you call sleep(-1)) in Windows, it means sleep infinitely. Possible use case is to put an application in sleep unTIL waken up by signal.

Seems like only Windows do that.

To start a VirtualBox VM instance in a ssh session, we can run this command

   VBoxManage startvm ea777d64-ad50-4d48-ae86-c856237932a0 --type headless

The key is the parameter --type headless

Sorting vs Ordering

http://en.wikipedia.org/wiki/Dihedral_angle

In geometry, a dihedral or torsion angle is the angle between two planes.