With a custom extension, you could. Just use the insert_comment_end hook, then do something like this:

if(ee()-&gt;input-&gt;is_ajax_request())
{
    ee()-&gt;extensions-&gt;end_script = TRUE;
    $data['comment_id'] = $comment_id;
    $data['moderated'] = $comment_moderate;
    echo json_encode($data);
}


Comment form json?
I'm having trouble understanding the simple "planetary" model of the atom that I'm being taught in my basic chemistry course. 

In particular, 


I can't see how a negatively charged electron can stay in "orbit" around a positively charged nucleus. Even if the electron actually orbits the nucleus, wouldn't that orbit eventually decay? 
I can't reconcile the rapidly moving electrons required by the planetary model with the way atoms are described as forming bonds. If electrons are zooming around in orbits, how do they suddenly "stop" to form bonds.




I understand that certain aspects of quantum mechanics were created to address these problems, and that there are other models of atoms. My question here is whether the planetary model itself addresses these concerns in some way (that I'm missing) and whether I'm right to be uncomfortable with it. 
