What does Open-mindedness really mean?

Many of us scientists are often accused of not being "open-minded" about a variety of "explanations" that others have come up with for a range of phenomena, real and imagined: from creationism to intelligent design, homeopathy to anti-vaccinationism, astrology to psychic phenomena... the list goes on! Its a real stumper, this accusation, because how can we be conducting science at all if our minds are closed to alternative hypotheses? It is more often the case that the accusers, whether purveyors of woo or merely gullible to it, haven't really thought through this notion of open-mindedness. This video should help clarify what it actually means, and why some of us practicing scientists are likely to dismiss some of these "alternatives" rather readily!