#
#Mon Aug 09 11:42:17 CEST 2010
Slide__WhHu4KOaEd-WfYQ0GneCwQ_footer=
Slide__WhHu4KOaEd-WfYQ0GneCwQ_subTitle=
Slide__WhHu4KOaEd-WfYQ0GneCwQ_title=Why does a mass act like a lens ?