If you have a few beautiful trees scattered across your yard, take these precautions to ensure they're able to survive during ...

Throughout Earth's history, ice caps have been very rare, but a model of the past 420 million years suggests an explanation ...

Observers are regularly responding to calls and text messages from people fearful about immigration officials in the ...

Clever engineering and regular maintenance keep a 100-year-old dam and levee system operating, protecting more than $10 billion in property annually.