Answer: direct observation and experiment.
It was successful because when all blacks boycotted the buses, that takes a huge chunk of change out of the cities bus money which was a staple in how the city lived. Don't quote me on that though. Sorry it took someone 2 hours to respond to your question. Hope I helped :D
These included hand axes, spear points for hunting large game, scrapers which could be used to prepare animal hides and awls for shredding plant fibers and making clothing. Not all Stone Age tools were made of stone.
