A Quote by Joao Magueijo on physics, einstein, and energy
When you put numbers into this formula [E=mc2] and perform a short calculation, the implication is that inside 1 gram of matter lies dormant an energy equivalent to the explosion of about 20,000 kg of TNT.  But that's obviously wrong, isn't it? How did Einstein cope with this enormous contradiction? No worries, Einstein pointed out that we do not notice energy, but only variations in energy. I feel cold if thermal energy moves from my body into the environment. I feel my car accelerating if I push the accelerator pedal and burn fuel, thereby taking chemical energy from the fuel and converting it into motion. The tremendous amount of energy harnessed inside 1 gram of matter passes unnoticed because it is never released into the world; it's just like a huge reservoir of energy sitting inside a body, never making its presence known.
Source: Faster Than the Speed of Light: The Story of a Scientific Speculation, Pages: 37..38
Contributed by: Laurie