Back when I was studying electronics in college in the 1970s, we were
taught that a 1-Ohm resistor and a 1-Farad capacitor would create a RC
circuit with a time constant of 1.1 seconds -- and that since it was
physically impossible to make a 1-Farad capacitor, we would never actually
see such a circuit in real life.

Of course, you can now order a 1-Farad capacitor for a few bucks from
Digi-Key. But they didn't stop there.

On page 18 of this month's RadComm (RSGB) there is a brief item about
"ultracapcitors". The devices are available in values up to 3,000 Farads.
**3,000 Farads**. Amazing.

http://www.maxwell.com/ultracapacito...l/bcap3000.asp