1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Washington, Seattle, WA 98195 (corresponding author).
2. Research Scientist, Dept. of Design and Environmental Analysis, Cornell Univ., Ithaca, NY 14850.
3. Professor, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843.
4. Executive Director, Teach the Future, Inc., Houston, TX 77004.