Hungry animals that have once tasted an adult monarch butterfly leave others alone. The adult's bad taste comes from special chemicals in the milkweed that the caterpillar ate.
A clean, green power machine
A clean, green power machine German scientists have found a new and safer way
to generate the hydrogen needed to power hydrogen fuel cells. The
new method involves extracting the hydrogen from propane, which can
safely be stored close to the fuel cell. Hydrogen fuel cells emit
only water as a by-product. 10 APRIL 1999, P. 16
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