Index: wp-content/themes/twentyten/single.php
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--- wp-content/themes/twentyten/single.php	(revision 14406)
+++ wp-content/themes/twentyten/single.php	(working copy)
@@ -26,7 +26,7 @@
 					<div class="entry-meta">
 						<span class="meta-prep meta-prep-author"><?php _e( 'Posted on ', 'twentyten' ); ?></span>
 						<a href="<?php the_permalink(); ?>" title="<?php the_time(); ?>" rel="bookmark"><span class="entry-date"><?php echo get_the_date(); ?></span></a>
-						<span class="meta-sep"><?php _e( ' by ', 'twentyten' ); ?> </span>
+						<span class="meta-sep"><?php _e( ' by ', 'twentyten' ); ?></span>
 						<span class="author vcard"><a class="url fn n" href="<?php echo get_author_posts_url( get_the_author_meta( 'ID' ) ); ?>" title="<?php printf( esc_attr__( 'View all posts by %s', 'twentyten' ), get_the_author() ); ?>"><?php the_author(); ?></a></span>
 					</div><!-- .entry-meta -->