Sure. I'm an astrophysicist so I like to go down to talk about space and science and give a bit of a counterpoint to the many preachers that are there. I made a hand-written placard saying "Ask me about the Big Bang" and a few little signs to put on the fence.

People tend to come over pretty quickly, mainly because the sign is funny and photogenic and they want a picture. That helps build a small crowd fast.

Most people tend to be quiet, with conversations dominated by a couple of people. Because I'm not being very confrontational, unlike most of the speakers, the people who just want a yelling match tend to get bored and move on quickly. My format is to mainly just ask for questions but then use the answers to launch a short monologue about some area of interest, whether it's stellar life cycles of the contents of the universe or whatever.

The most common question most times is "what was before the Big Bang", which has some good answers and is nice because it quickly takes us to the edge of current research, which is good to demonstrate. Apart from that lots of people tend to ask philosophical or sometimes religious questions; I tend to try to answer those by quickly leading into something more scientific. Quite a few people ask questions about popular science topics like Schrodinger's Cat or Dark Matter - these are pretty fun to answer.

It was a great day today.