>> so, atlantic bottlenose dolphins, which are the dolphins that are here at the national aquarium, are not endangered. but, as always, with any animal species, really, it's kind of human intervention sometimes that can threaten them. >> as "teen kids news" has often reported, all kinds of marine life can be harmed by pollution and debris like fish nets. dolphins are no exception. one way we can help protect dolphins is by learning more about them. we have a link to the national aquarium on our website. for "teen kids news," i'm scott. and i think i'm gonna need a new shirt. >> it's a dish developed by the ancient aztecs, easy to make, and fun to eat. great guacamole. >> nicole's in the kitchen expert, chef johnny prep. this week, she's learning how to make a mean guacamole. >> so, i'm particularly excited about this, because i love guacamole. so, what's first? >> well, first, we got to talk about avocados, 'cause, basically, guacamole is predominantly avocados. so, what you want to make sure is you buy as perfectly ripe as an avocado as you can get or buy them underripe and let them ri