Never use 7 words when four will do.I can't think of anything that I can do in 5 minutes without going over. The last time I did Boyle's law and ended up running for 12 minutes! ... thanks in advance for any suggestions!
As aquaregia mentioned, you can easily spend 5 min on signals (and still not thoroughly cover the topic).5 mins on buddy signals? I guess that's true if I add some more interactive parts.