A drone drops a small wooden projectile with three spiral tails and a seed mounted on the tip. It gently lands on the bare ground and sits there, exposed to the elements, until it rains. Then, the moisture penetrates the wood fibers, and the spiral tails start twisting, slowly pushing the seed into the ground, where it will germinate.
Click here for original story, Researchers: Drone seeding and E-seeds sound exciting, but ecosystem restoration needs practical solutions
Source: Phys.org