Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.

Thefirstpaperwasmadefromthebarkofthemulberrytree.

AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent

ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.

Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.