Some other experts say that the ancestor of the modern guitar was brought to Spain from Persia sometime in the twelfth century.

VOA: special.2010.05.12

Rebecca Skloot says she hopes that scientific companies that have gained from HeLa cells will give back to the family whose ancestor changed the history of medicine.

VOA: special.2010.07.21

That's how long it took for an international team of scientists to excavate and analyze the fossilized skeleton of a 4.4 million year old human ancestor, Ardipithecus ramidus, which was discovered in Ethiopia.

VOA: standard.2009.12.24