When flying over rural areas, particularly in the American Midwest, it is common to see row after row of immense green circles that sometimes touch but never overlap. These giant disks demark areas where agricultural land not blessed with abundant rainfall is made productive by pivot irrigation systems.
Precision Agriculture (English)
Guiding the First Generation of Space Elevators
Imagine stepping in to an elevator that will rise through the Earth’s atmosphere, all the way up to a platform suspended in space. The platform is a space terminal where you will depart for destinations within our galaxy or possibly beyond. The Space Elevator will allow people to travel through the atmosphere smoothly without being propelled by rocket into space.
Space Elevators (English)