​Hydraulic fracturing is a natural gas mining technique that targets what kind of sedimentary rock?Yesterday's question was "What is the name of a device that measures electrical potential difference?" The answer was a voltmeter.

​What is the name of a device that measures electrical potential difference? Yesterday's question was "What shape best describes Earth’s current orbit around the Sun?" The answer was ellipse. 

​What shape best describes Earth’s current orbit around the Sun? Yesterday's question was "What type of nucleic acid is translated into a protein sequence?" The answer was mRNA.

​What type of nucleic acid is translated into a protein sequence? Yesterday's question was "Of the following 4 choices, name all that are amino acids: tryptophan; testosterone; cholesterol; niacin" The answer was tryptophan. 

​Of the following 4 choices, name all that are amino acids: tryptophan; testosterone; cholesterol; niacin. Friday's question was "What quadrant is not passed through by the line 5x + 3y = 15?" The answer was 3.