"If there's one thing we've learned about Lost, it's that the show attracts fans from nearly every walk of life—including scientists. So what episodes do researchers rank as their favorites? In preparation for the series finale, we asked seven scientists in various fields to look back on six seasons of Lost and pick their favorite episodes."

A poster for each episode.

"Because this can get awfully confusing — did Desmond meet Faraday before or after Ben wiped out the Dharma Initiative? — we've arranged some major events of the show's first five seasons in chronological order."