Resumen de ScientificAmerican 10.

Melinda Wenner, Sally Lehrman, Kate Wilcox, Gary Stix

• This article discusses people whose leadership in applying scientific knowledge to solve practical problems has led to change in 2009. Individuals discussed include Intel Corp. environmental manager Todd Brady, infectious disease prevention specialist Wafaa El-Sadr, and National Center for Science Education director Eugenie Scott. The impact of this scientific work on public policy and the development of technology is assessed.