code: function search(options, callback) {
    var queryURI = 'http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=' + options.terms + '&retmode=json&retmax=' + (options.count || 10);
    utils.retrieve(queryURI, callback);
  }
docs: Do the actual search.