Some mysteries can be solved if you just know what you're looking for — and where to find it.
The July 2 edition of the journal Science features a profile on reseacher Dolores Piperno, who perfected microscopic methods to trace the earliest evidence of corn among early peoples of in southern Mexico. Rather than focusing on the plant evidence of corn cobs, which put the date of the earliest domestication of corn at about 6,200 years ago, Piperno and her team looked for tiny bits of evidence among tools that might have used with corn.
Piperno, a scientist with the Smithsonian Institution's National Museum of Natural History and its Tropical Research Institute, and her team found grinding stones with traces of corn that dated to 8,700 years ago in the Balsas River Valley. This helped end a long debate about whether maize had been domesticated in the highlands or the lowlands, Science reported. Her techniques, while greeted with skepticism at first, were accepted by others in the field of archaeobiology.
Quoted the publication:
"That's exactly how you're supposed to do science," says archaeobotanist Deborah Pearsall of the University of Missouri, Columbia. "If you look at the corpus of Dolores's work, you see the power of a scientist who chooses her research topics on the basis of hypotheses she wants to test."
Read more about Piperno's work at Science (http://www.sciencemag.org/content/329/5987/28.full)