I put it in my mouth, and immediately regretted it. It tasted rotten, the flavor of, say, dirty feet. When the soup was gone, one of the girls took the jaw-bone and smashed it open with a rock. Then she sucked out the fatty marrow. This is a trick that scientists think people have been using for thousands of years.
Some paleontologists believe that early humans had an advantage over other animals.
They figured out how to use tools to get the nutritious, energy-rich marrow out of bones. The men finished making their arrows and got up to try them out. The arrows went whizzing through the air. The men could hit a small stump at 50 yards. When John tried the bow, the arrow spilled out onto the ground in front of him.