The word-skipping technique relies on the fact that it's a good idea to skip unfamiliar words in a passage in order to focus on:

The word-skipping technique relies on the fact that it's a good idea to skip unfamiliar words in a passage in order to focus on the main idea of the passage. Basically, to make sure the overall outcome is understanding the entire passage as a whole, it is best to skip the words you are unaware of and analyze them later. Often times, as you read the entire passage in full and grasp the main idea, you are able to make sense of the unfamiliar words. 

During the paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering  plants  and fishing, hunting or scavenging wild  animals. the paleolithic is characterized by the use of knapped stone tools, although at the time humans also used  wood  and bone tools.