California couple Joe and Gina Mistretta bought their potted potted Scotch pine 34 years ago and have used it ever since Charlotte Phillipp is a Weekend Writer-Reporter at PEOPLE. She has been working ...

How do scientists diagram evolutionary relationships? Scientists represent evolutionary relationships with tree diagrams (also called cladograms) because new life forms appear the way new branches ...

Anti-neutrophil cytoplasmic antibodies (ANCAs), such as those directed towards proteinase 3 (PR3) and myeloperoxidase (MPO), are associated with a distinct form of small-vessel vasculitis, known as ...