Pretty amazing. Make sure you check out the videos. Here's one of them:
http://download.current-biology.com/supplementarydata/curbio/17/23/r1004/DC1/mmc7.mpg

Quoted: Clearly, the chimps have the number thing down. So the researchers added an element of spatial memory, as you can see in this movie. After the first digit is touched by the test subject, the remaining numbers are obscured. As that video makes clear, this didn't slow down the chimp significantly. As a final test (shown here), the chimp is only afforded a brief glimpse of the numbers; his success rate didn't budge significantly. In contrast, humans (specifically college students) had a hard time with this test, barely outperforming the mother and losing badly to the young chimp.

Quoted: Bakewell, Zhang and a colleague found that substantially more genes in chimps evolved in ways that were beneficial than was the case with human genes.
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The results could be due to the fact that over the long term humans have had a smaller effective population size compared with chimps.

Interesting. It *appears* that dogs console others as well...but no mention in the article.

Quoted: Dr. Frans de Waal argues that human morality would be impossible without certain emotional building blocks that are clearly at work in chimp and monkey societies.
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To console another, Dr. de Waal argues, requires empathy and a level of self-awareness that only apes and humans seem to possess. And consideration of empathy quickly led him to explore the conditions for morality.