How do I use a radon testing kit?

— James Dio Tempe, AZ

Answered by Joshua Lloyd on April 16, 2012

Is natural authentic wood toxic?

— neidilane gonzales Santa Clara, CA

Answered by Polly Osborne, FAIA, LEED AP on March 24, 2012

Is the use of concrete in the home bad for your health?

— Julie Lefebvre Cambridge, MA

Answered by Harold Remlinger, AIA, LEED AP, NCARB on February 14, 2012