Stratified random sampling is a method of sampling that divides a population into smaller groups that form the basis of test samples.

A NASA spacecraft will complete a round-trip journey to an asteroid this weekend, returning to Earth after a seven-year voyage to bring back unspoiled rock specimens from an alien world that could ...

NASA’s OSIRIS-REx spacecraft will make its first attempt to collect a sample from asteroid Bennu on Oct. 20. Dante Lauretta, OSIRIS-REx principal investigator and a professor of planetary science and ...

NASA's Perseverance Mars rover is preparing to collect its first-ever sample. The agency's Southern California-based Jet Propulsion Laboratory (JPL) said that the rover was searching for a ...

A sample tube on the Martian surface in the shadow of the Perseverance rover. Perseverance is continuing to collect samples as NASA develops a new plan for returning them to Earth. Credit: ...

A model looked at the numbers associated with detecting and containing a potential African swine fever virus (ASFV) outbreak in the U.S. and found that sampling and laboratory capacity are areas of ...

Understand isokinetic sampling in unidirectional airflow to support accurate particle monitoring and cleanroom compliance.