Other

If a page is down try to use its cached version:

http://webcache.googleusercontent.com/search?q=cache:example.com/page.html

In Unix-like operating systems, a device file or special file is an interface to a device driver that appears in a file system as if it were an ordinary file.
On Linux they are in the /dev directory, according to the Filesystem Hierarchy Standard.

"Double space is a soft break"
You can use any html syntax inside a markdown file

About OVA files:
An OVA file is an Open Virtualization Appliance that contains a compressed, "installable" version of a virtual machine. When you open an OVA file it extracts the VM and imports it into whatever virtualization software you have installed on your computer. Neovim is much faster than vim