When hundreds of sharp-toothed piranhas gather to attack, they can kill a cow in minutes!
Fire and lightning
Fire and lightning Research indicates that smoke from forest fires in
Mexico has affected lightning in the central U.S. The smoke has
reversed the electricity of some lightning strikes, changing them
from "negative" strikes to "positive" strikes. Positive lightning
strikes are more destructive than negative ones, and cause
electrons to stream up from the Earth to the clouds. During the
smoky periods, the incidence of positive strikes tripled and
scientists believe that the smoke may affect the development of
charges in the strikes. 10 OCTOBER 1998, P. 25
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