Free will or not?

Hi everyone,
I just read an interesting article about Free Will and this was it's summary: Even worms have free will. If offered a delicious smell, for example, a roundworm will usually stop its wandering to investigate the source, but sometimes it won't. Just as with humans, the same stimulus does not always provoke the same response, even from the same individual.

My question to you: Is there such a thing as Free Will or not?