SINCE the ionosphere is a doubly refracting medium, due to the influence of the earth's magnetic field, a plane-polarized radio wave incident normally on it is split into two elliptically polarized ...

Every day we make choices in our lives that affect the environment, the climate and other species. From what we eat to how many children we decide to have, there’s a lot we can do to “choose wild” and ...

This page is no longer being updated and reflects the status of vaccine progress through March 4, 2021. For more coverage about the pandemic, visit our coronavirus hub. 3 vaccineshave been determined ...

Approximately 80 billion animals (not including fish) are slaughtered globally each year in the meat, dairy, and egg industries, according to the Food and Agriculture Organization of the United ...