Question: Title: Not for EVERY head Review: Like another reviewer said, this mask doesn't fit well if you've got a somewhat big/wide head. Shame on me for not fully testing this before a recent triathlon! I had to complete the darn swim portion using strokes other than freestyle--since anytime I twisted my head during freestyle, water leaked into the side of this mask. Clearly, it's one size fits *some*. If you happen to wear a large-ish hat size, think again about buying this particular mask. Does this product review convey a negative or positive sentiment?
Answer: Negative

Question: Title: Buy the other version Review: This is the dumbed down version. Get the one with David Attenborough. This one is for junior high level of elementary school. Does this product review convey a negative or positive sentiment?
Answer: Negative

Question: Title: this is a text for grad school Review: I usually sell off my text books but felt this will be useful for future courses. Thorough and explains well. Does this product review convey a negative or positive sentiment?
Answer: