 A capital fourth tonight at 8 with an immediate rebroadcast at 9.30 on Maine Public Television and at mainepublic.org. On a boat in the Caribbean, one scientist is playing the long game with whale research. So I've come to know a lot of them as individuals, as mothers and daughters and babysitters. And that's led us to ask them really, really interesting questions about who whales are and what whales do and how they talk to each other.