21.   Because DNA and proteins carry electrical charges, they would switch the transistors on, setting off an alert.

22.   -- An unspecified electrical charge detonated near the tank.

23.   A battery implanted under the skin delivers a slight electrical charge that modulates pain signals.

24.   A hinge-like linkage connects each wing to a piezoelectric motor, which is simply a ceramic strip that flexes under an electrical charge.

25.   But because of the lower radioactivity of those nuclear materials, the trick to detecting them is to look for the subatomic particles with no electrical charge called neutrons.

26.   But unlike electrons, they have no electrical charge at all.

27.   By varying the electrical charge, he discovered, it is possible to increase or decrease the strength of the bond.

28.   Conventional semiconductor memory chips store the ones and zeros of digital computer code as tiny electrical charges.

29.   Current external defibrillators use the same electrical charge as early models.

30.   Either way, the color of each tiny bead can be switched by applying an electrical charge through the circuitry embedded into the material.