1. Boats. They came with boats. Those boats were propelled by wind, needing sails woven from cloth, strong cloth. The boats were aquadynamic, requiring engineering and mathematics. The boats got here via compass navigation, needing the knowledge of magnetism and Earth's MN... https://twitter.com/prudy_maluleke/status/1288416645434806272

2. ...requiring extensive geographical knowledge. On those boats were storages of gunpowder, invented by the Chinese, which means very early trade with the East. The boats were also equipped with preserved food, necessitating knowhow of chemistry etc.

3. To keep the massive panels of wood (woodworking) together, large nails and brackets were used (metallurgy) to secure the panels in place, which requires architecture and designing.

I can't remember what my point was.