Readers ask the Massachusetts Democrat about his biggest criticism of Obama, how Congress has changed during his four-decade-long tenure—and his recent gay wedding.

Readers ask the author of 'The End of Men: And the Rise of Women' about the perils of today's hook-up culture, whether discrimination is responsible for the wage gap, and whether the so-called 'end of men' is good for women.

Readers ask the comedian, actor, and author how to prepare for the apocalypse, the best part about appearing on 'The Daily Show,' and how to grow a proper mustache.

Readers ask 'Atlantic' columnist Ta-Nehisi Coates about whether the GOP is racially motivated, black figures who hinder race relations, and what Trayvon Martin meant to him.

Readers ask 'Newsweek' & The Daily Beast's editor-in-chief about the controversial magazine cover she killed, her most satisfying achievement at 'The New Yorker,' and why she moved across the pond.

Readers ask science journalist Jesse Bering about the evolutionary advantages to believing in God, the mysteries of female ejaculation—and why the penis is shaped like that.

Readers ask the Open Zion editor about the value of preserving a Jewish state, the philosophical generation gap among American Jews when it comes to Israel, and the most unfair criticism of his controversial book, 'The Crisis of Zionism.'

Readers ask the Roman Catholic nun where she stands on the contraception battle, whether women should be allowed into the priesthood, and her stance on the Vatican's recent attacks on American nuns.

Readers ask the environmentalist and author whether it's too late to ward off climate change, how we can prepare for the worst, and how to save the world.

Readers ask the science writer, evolutionary psychologist, and author of 'The Better Angels of Our Nature: Why Violence Has Declined' about the most violent period in history, the impediments to world peace, and the case for nuclear weapons.