Charles Black, John McCain's chief campaign strategist, discussing how a hypothetical terrorist attack on U.S. soil would affect his candidate's chances in the general election

NASA scientist Sam Kounaves, the Mars mission's lead chemist, on the planet's soil, which is now believed to contain the nutrients to support life

Supreme Court Justice Anthony Kennedy, writing the majority opinion that overturned a law permitting the execution of child rapists

Afghanistan intelligence spokesman Sayeed Ansari, publicly asserting for the first time that Pakistan's Inter-Services Intelligence was responsible for an April attempt to assassinate Afghan President Hamid Karzai

Presumptive Democratic nominee Barack Obama, when asked by Rolling Stone about how past nominees from his party seemed to "cower" in the face of Republican attacks

Russian tennis player Alla Kudryavtseva, who upset third-seeded Maria Sharapova in Wimbledon's second round, on the sheer, tuxedo-style get-up that Sharapova wore during the match

Former Alaska fisherman Andrew Wills, whose herring business collapsed as a result of the Exxon Valdez oil spill, on the Supreme Court's decision to cut punitive damages in the case from $2.5 billion to $500 million. Wills's share will be $15,000 instead of $85,000.

Former Democratic presidential candidate Hillary Clinton, in her first public appearance with her primary-season rival Barack Obama

Centers for Disease Control Dr. Patricia Griffin, noting that government investigators now believe tomatoes may not be the only culprits in the national salmonella outbreak