Using the latest Firebird release, 0.6, every row of words under the "Latest news" overlaps the adjacent rows. To reproduce the bug, simply go to http://www.newscientist.com
The site explicitly sets "line-height: 75%". Which means "only move the next line 75% as far as you would normally move it to make the text not overlap". So you get overlap. Any browser that does not show it this way is pretty buggy.
I see. Thanks!