The vessels they made could be used for storing water and food. They also made cooking easier. At about the same time, people were learning to grind grain into flour by using shallow stone bowls called mortars and club-like stone pestles. Wooden ploughs that could be drawn by oxen were first used in the Near East around 4000 bc, about the same time as one of the most important inventions of all - the wheel. Barrows and megaliths are relics of the Neolithic and Bronze Age in NW Europe.
Barrows are burial mounds.
Megaliths are made from huge slabs of stone. Sometimes they are tombs too. No one is sure what they were used for. 3000 years ago Homo erectus to Cro-Magnon man gather plant food and hunt with flint weapons. Population grows and craft skills develop.