Ask a specific question. "Excuse me, did you catch what the speaker was saying about async routines? I think I've done async before but I'm not sure." Now the p

Ask a specific question. "Excuse me, did you catch what the speaker was saying about async routines? I think I've done async before but I'm not sure." Now the person you're talking to can explain something, and you can segue the conversation into some related topic.