Review: smart , funny and 
Sentiment: positive

Review: that its intended audience has n't yet had much science 
Sentiment: negative

Review: marshall keeps the energy humming , 
Sentiment: positive

Review: even when there are lulls , the emotions seem authentic , and the picture is so lovely toward the end ... you almost do n't notice the 129-minute running time . 
Sentiment: positive


Review: the thornier aspects