To kill by lead poisoning, often through
Leadpipes in the
kitchen (colonel mustard) in the italian bath when burying the lead in
Rome when roaming through the
space between
2 g balls projected from rifled barrels at a velocity faster than
300 meters
per second though less than 300 million meters per second. Until they dont. Crash. In some eras and generations in some parts of some planets the ball of lead, element 82, can be replaced with plutonium that has half-lifed down to lead levels.
Also painted onto school walls
Also liquefied and then volatilized into the atmosphere in combustion rather than engines used to propel vehicles in the 1900s.