“The contracts are usually written to protect the wealthy people who are commissioning the baby,” says University of Pennsylvania ethicist Dr. Arthur Caplan. More →

August 17, 2012

Washington Post science writer Rick Weiss discusses the practical and ethical questions raised by recent embryonic stem cell research, including efforts in Britain to clone human embryos using eggs from other species. More →

January 25, 2008

A series of significant developments have emerged in recent weeks in the field of stem cell science. Each adds exciting prospects for treating disease; each adds vexing complexity. With us to help understand the science and the issues: Rick Weiss, science writer for The Washington Post. More →

January 25, 2008