Pygmy sperm whales (Kogia breviceps) are among the ocean's most enigmatic inhabitants—rarely seen and largely unstudied. They live far offshore in small groups, diving in search of squid and fish.

Pyuria is a condition defined by the increased presence of white blood cells in urine. Although a urinary tract infection is the most common cause of sterile pyuria, other conditions may be involved.

Mark Gurarie is a writer covering health topics, technology, music, books, and culture. He also teaches health science and research writing at George Washington University's School of Medical and ...