Ask HN: What is science?

I was talking with a coworker about psychology and what is classified as science. He was saying that taking a hypothesis and performing a test on it to find answers is science.

I was under the impression for something to be considered scientific that it has to be repeatable and verifiable no matter where the test was done or who performs the test. Where as psychology based tests deviate from that.

This just raised the though of... what is science exactly? I'm curious what all of you consider science.