Therefore, it is difficult to deal with polygonal no-fly zone (PNFZ) constraints that are common in actual flight environment of the HGV. To solve this problem, this article proposes a general PNFZ ...

In a dramatic turn, the political leaders, accompanied by community elders and Tana River County Commissioner David Koskei, ...

Peru’s decision to reduce the boundaries of the Nazca Archaeological Park by 1,000 hectares has sparked concern among ...

A KFF Health News analysis found people in these “dead zones” live sicker and die younger on average than their peers in well-connected regions. KFF Health News and partner InvestigateTV tell the ...