Well my Saturn uses 300watts/mile.
watts is not an energy unit, it's a power unit. To get a figure for the energy used we need to know how long it took you to travel that mile. If you're* using 300watt-years/mile it's not so good...
* see the punctuation there?
it allows you to get strings back from commands and use them as the text of the script as if you had typed it directly. I think this was a new idea that I, at least, had not seen in scripting languages, except perhaps LISP,
Greenspun's Tenth Rule: "Any sufficiently complicated C or Fortran program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp"
Everything is somewhat vulnerable, and a determined intruder with infinite resource will almost always find a way in.
The point is facial recognition alone is so vulnerable! All you need is a cameraphone and a photo printer - and you can't revoke your face as your password either. At least with fingerprints you can get hacked nearly 10 times (on average) before it becomes a problem.
Sendmail may be safely run set-user-id to root. -- Eric Allman, "Sendmail Installation Guide"