Ms. SOUSA NASIR: We don't do anything to them, and they destroy our house.

NPR: Israeli Troops Leave Gaza Town in Ruins

Once you've got them, you don't need to destroy any more embryos, but each time you get a new one of these embryonic stem-cell lines, you need to destroy an embryo.

NPR: Ethical Guidelines for Stem Cell Research Proposed

Obama is likely to note that most of the demonstrators don't want to destroy the values that America and the West cherish, they want more of them.

BBC: Arab Spring headaches for Barack Obama