Wanted to try to scrape "mechanisms by which are understood remain unclear" from nature. Instead, found it easier to use PubMed API.
import requests
base_url = 'http://api.nature.com/content/opensearch/request'
nature_dict = {'queryType':'cql',
'query'cql.keywords+any+darwin+OR+cql.keywords+any+lamarck&httpAccept=application/json&api_key=<API key string here>