Mercury is a very good conductor of electricity! Just isn't as good in cables like copper due to its tendency to be liquid at room temperatures!

Don't believe me, watch this!! http://www.youtube.com/watch?v=1tZx3gR5kNI <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

Also fluorescent tubes are phosphor covered glass tubes filled with mercury vapor that light up when electricity is CONDUCTED from one side to the other.

Mercury is an amazing super conductor!

Mercury conducts through Electromagnectic waves (EMR)
http://64.233.183.104/search?q=cache:jgfD4WXoeiUJ:findarticles.com/p/articles/mi_m151