answer: #Person1# thanks #Person2# for filling #Person1# in on yesterday's lecture. The lecture is about the evolution of sea life, which is a continuation from last week. #Person1# thinks some squid are large, and #Person2# says it's because they lost their shells and mentions some unusual cases.
documents: #Person1#: I really appreciate your filling me in on yesterday's lecture.
  #Person2#: No problem. I thought you might want to go over it together. And, anyway, it helps me review, Hope you're feeling better now.
  #Person1#: I am. Thanks. So, you said she talked about squid? Sounds a little strange.
  #Person2#: Well, actually, it was about the evolution of sea life--a continuation from last week. The octopus and the squid descended from earlier creatures with shells. They survived by shedding their shells--somewhere between 200 and 500 million years ago.
  #Person1#: That's a pretty long span of time.
  #Person2#: I know. That's what she said, though. To be precise: 'Exactly when they emerged is uncertain ... and why is still unexplained.'
  #Person1#: Some squid are really huge. Can you imagine something that big if it still had a shell?
  #Person2#: Actually, it's because they lost their shells that they could evolve to a bigger size.
  #Person1#: Makes sense. But some are really huge. I've read about fishermen that caught squid that weighed over a ton. Did she talk about how that happens?
  #Person2#: Not really. But she did mention some unusual cases. In 1933 in New Zealand they caught a squid.., let's see here.., it was twenty-two yards long. Its eyes were eighteen inches across. Can you imagine?
  #Person1#: Reminds me of all those stories of sea monsters.
  #Person2#: Dr. Simpson thinks there are probably even larger ones that haven't been found because squid are intelligent and fast---so they can easily get away from humans. Maybe some of those monster stories are true.