diff --git a/resources/recipes/dallas.recipe b/resources/recipes/dallas.recipe
index 8666fbef30..d46427caa9 100644
--- a/resources/recipes/dallas.recipe
+++ b/resources/recipes/dallas.recipe
@@ -7,22 +7,29 @@ class DallasNews(BasicNewsRecipe):
     max_articles_per_feed = 25
 
     no_stylesheets = True
-    remove_tags_before = dict(name='h2', attrs={'class':'vitstoryheadline'})
-    remove_tags_after  = dict(name='div', attrs={'style':'width: 100%; clear: right'})
-    remove_tags_after  = dict(name='div', attrs={'id':'article_tools_bottom'})
+    use_embedded_content = False
+    remove_tags_before = dict(name='h1')
+    keep_only_tags = {'class':lambda x: x and 'article' in x}
     remove_tags = [
-       dict(name='iframe'),
-       dict(name='div', attrs={'class':'biblockmore'}),
-       dict(name='div', attrs={'style':'width: 100%; clear: right'}),
-       dict(name='div', attrs={'id':'article_tools_bottom'}),
-       #dict(name='ul', attrs={'class':'articleTools'}),
+            {'class':['DMNSocialTools', 'article ', 'article first ', 'article premium']},
     ]
 
     feeds          = [
-                      ('Latest News', 'http://www.dallasnews.com/newskiosk/rss/dallasnewslatestnews.xml'),
-                      ('Local News', 'http://www.dallasnews.com/newskiosk/rss/dallasnewslocalnews.xml'),
-		      ('Nation and World', 'http://www.dallasnews.com/newskiosk/rss/dallasnewsnationworld.xml'),
-		      ('Politics', 'http://www.dallasnews.com/newskiosk/rss/dallasnewsnationalpolitics.xml'),
-		      ('Science', 'http://www.dallasnews.com/newskiosk/rss/dallasnewsscience.xml'),
+                      ('Local News',
+                          'http://www.dallasnews.com/news/politics/local-politics/?rss'),
+                      ('National Politics',
+                          'http://www.dallasnews.com/news/politics/national-politic/?rss'),
+                      ('State Politics',
+                          'http://www.dallasnews.com/news/politics/state-politics/?rss'),
+                      ('Religion',
+                         'http://www.dallasnews.com/news/religion/?rss'),
+                      ('Crime',
+                          'http://www.dallasnews.com/news/crime/headlines/?rss'),
+                      ('Celebrity News',
+                          'http://www.dallasnews.com/entertainment/celebrity-news/?rss&listname=TopStories'),
+                      ('Nation',
+                          'http://www.dallasnews.com/news/nation-world/nation/?rss'),
+                      ('World',
+                          'http://www.dallasnews.com/news/nation-world/world/?rss'),
                     ]
 
diff --git a/src/calibre/ebooks/conversion/preprocess.py b/src/calibre/ebooks/conversion/preprocess.py
index 087d8ed486..f728bec52b 100644
--- a/src/calibre/ebooks/conversion/preprocess.py
+++ b/src/calibre/ebooks/conversion/preprocess.py
@@ -459,7 +459,7 @@ class HTMLPreProcessor(object):
                 try:
                     search_re = re.compile(search_pattern)
                     replace_txt = getattr(self.extra_opts, replace, '')
-                    if replace_txt == None:
+                    if not replace_txt:
                         replace_txt = ''
                     rules.insert(0, (search_re, replace_txt))
                 except Exception as e:
diff --git a/src/calibre/gui2/convert/heuristics.ui b/src/calibre/gui2/convert/heuristics.ui
index 4358512996..6863fcf8e6 100644
--- a/src/calibre/gui2/convert/heuristics.ui
+++ b/src/calibre/gui2/convert/heuristics.ui
@@ -17,11 +17,14 @@
    <item>
     <widget class="QLabel" name="label">
      <property name="text">
-      <string>&lt;b&gt;Heuristic processing&lt;/b&gt; means that calibre will scan your book for common patterns and fix them. As the name implies, this involves guesswork, which means that it could end up worsening the result of a conversion, if calibre guesses wrong. Therefore, it is disabled by default. Often, if a conversion does not turn out as you expect, turning on heuristics can improve matters.</string>
+      <string>&lt;b&gt;Heuristic processing&lt;/b&gt; means that calibre will scan your book for common patterns and fix them. As the name implies, this involves guesswork, which means that it could end up worsening the result of a conversion, if calibre guesses wrong. Therefore, it is disabled by default. Often, if a conversion does not turn out as you expect, turning on heuristics can improve matters. Read more about the various heuristic processing options in the &lt;a href=&quot;http://calibre-ebook.com/user_manual/conversion.html#heuristic-processing&quot;&gt;User Manual&lt;/a&gt;.</string>
      </property>
      <property name="wordWrap">
       <bool>true</bool>
      </property>
+     <property name="openExternalLinks">
+      <bool>true</bool>
+     </property>
     </widget>
    </item>
    <item>