You're analyzing dna pulled from a strand of hair found at a scene of a crime. in terms of what most hair analyses results prove, statistically speaking, you'd most likely be working towards:

In terms of what most hair analyses results prove, statistically speaking, you'd most likely be working towards an inconclusive result. DNA testing has overturned many convictions that relied on hair analysis, and after a study conducted by the Department of Justice, it was found that a high proportion of testimony could not be supported by the state of science of hair analysis.

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.

the united states broke it's neutrality was the constant german sinking of trading vessels resulting in the loss of lives, one example would be the lusitania.