Q. What do bulletproof vests, fire escapes, windshield wipers, and laser printers all have in common?

all invented by women.......i've heard this beforeQ. What do bulletproof vests, fire escapes, windshield wipers, and laser printers all have in common?
Kevlar reinforcementQ. What do bulletproof vests, fire escapes, windshield wipers, and laser printers all have in common?
None of them contain Americium, an artificial element found in smoke detectors.
all invented by women. =D
They all contain vowels. =)
they uhmm are all made of two words!
they're all things my cellphone comes equip with.

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