Following the study, Puerto Ricans from across the island and many living on the mainland had their DNA tested by submitting samples of their saliva.

VOA: standard.2010.04.05

They gathered hundreds of sea creatures and water samples to measure the garbage patch's effect on ocean environment.

VOA: special.2009.09.22

They also will study chemical and physical properties of the soil samples with a method called infrared spectroscopy.

VOA: special.2009.01.20

The chip removed ninety-nine percent of the salt and other harmful substances from water samples.

VOA: special.2010.04.05

Samples of dung will also be gathered, photographs taken, and acoustic instruments will record the animals' distinctive calls.

VOA: standard.2010.01.05

The research team used what are called core samples from hundreds of trees throughout Southeast Asia.

VOA: standard.2010.04.05

One of those scientists. Kim Cecil,from the University of Cincinnati She was part of a team of researchers who took annual blood samples from several hundred lead-exposed children for more than 20 years.

VOA: standard.2009.12.19