. >> we wrapped up a section of a lesson on a plate tectonics, here at the exploratory and -- exploritorium excited to see people here having fun and learning about science? >> the people that come here are some selected to begin with, they actually enjoy science. i teach teachers to have fun with their kids. the general public is a great audience, too. they're interested in science. >> we have a blast every time. they have different names. >> they have a bar and a cafe. everything i need. we are excited for the speaker. >> it is nice to be in the exploratorium when there are not a lot of kids around. >> before tonight, i never knew there were major league rules to rock, paper, scissors. i am getting ready to enter into a competition. sarah's here to give me some tips. what do i need to do to win it? >> this is a game of chance, to a degree. one of the best ways to bring it home is a degree of intimidation, maybe some eye contact, maybe some muscle. it is a no contact sport. sheer i contact is a good way to maybe intimidate to see if you can set them off, see if they throw something they di