One of the great fascinations in politics is how apparently unconnected events can coincide to lethal effect.

BBC: Health reform: A suitable case for treatment?

This is why highly oxidized water has a lethal effect on bacteria.

FORBES: Holy Water

These horns can be used to lethal effect and the oryx has been known to use them to kill lions.

BBC: Zoo kills endangered antelopes

She says the withdrawal of aid agencies has had a lethal effect.

NPR: Aid Agencies Targeted in Darfur Conflict

This problem is compounded by the possible presence of multiple chemicals which together have an additive effect that greatly increases the lethal action of any single chemical.

CNN: Chemicals killing Florida birds, fish