You may try this:
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} ([^/]+)/? [NC]
RewriteRule .* index.php?url=%1 [L,QSA]
It will map silently:
http://diverseevolution.com/anything/
To:
http://diverseevolution.com/index.php?url=anything