Petrified wood is one of the most sought-after materials in the world for both its aesthetic value and its scientific value.

Such tests can offer a far more scientific way of checking a person's lineage, and new research suggests an analogous ancestry test for black holes. Rather than relying on a cheek swab or a little ...

Garcia was on hand to answer questions from users, such as when she got her fallopian tubes removed (September) and why she took a test in the first place. "I felt weird and sick. I know my body ...