The ancient Egyptians had knowledge to some extent of sail construction. This is governed by the science of aerodynamics. The earliest Egyptian sails were simply placed to catch the wind and push a vessel. Later Egyptian sails dating to 2400 BCE were built with the recognition that ships could sail against the wind using the lift of the sails. Queen Hatshepsut oversaw the preparations and funding of an expedition of five ships, each measuring seventy feet long, and "with several sails".Various others exist, also.