Physics Problems (video solutions)
$cat
"; $cat = addslashes($cat); $result = mysql_query("select * from hwvideo where category='$cat'"); while($row = mysql_fetch_array($result)) { $desc = $row['description']; $youtube = $row['youtube']; $md5 = $row['md5']; print("
$desc
"); } } } open_sql(); get_categories(); ?>

Mechanics Problems (text-based solutions)

Electricity and Magnetism (E+M) (text solutions)