Earth’s frozen places — ice sheets, glaciers and permafrost — are melting: a clear sign of climate change and a planet ...

President Trump abruptly stopped providing foreign aid. He says it is a waste of taxpayer money. Critics say his move will cause a humanitarian catastrophe and hurt the United States. What do you ...

Satellites connect people around the world but they also interfere with astronomers’ views of the cosmos. There are ways to reduce these tensions.

Out on the playground, small groups of children are running around with clipboards and long strips of paper. It is “Pi Day,” and the ... on the unit circle and to introduce the concept of polar ...