Podcast
Questions and Answers
European peasants would insert a wooden ______ in a round hole and rotate it briskly between their palms
European peasants would insert a wooden ______ in a round hole and rotate it briskly between their palms
drill
Studies of primitive societies suggest that the earliest method of making fire was through ______
Studies of primitive societies suggest that the earliest method of making fire was through ______
friction
This process could be speeded up by wrapping a cord around the ______ and pulling on each end
This process could be speeded up by wrapping a cord around the ______ and pulling on each end
drill
