What can I expect at a Unitarian Universalist service?

I’m not a church person, being a mostly non-practicing Jew and all. However, there’s a UU church (temple?) on my block that I’ve become increasingly intrigued by. I’m kinda exploring my own spirituality and stuff. They seem friendly, with a rainbow flag flying and there seems to be a lot of people my age going in and out. There will be a sermon on science and religion this weekend, and I’m thinking about checking it out just to see if I get anything out of it.

I’m wondering what can I expect at a UU service? I know every church is different, even within denominations, by the way.