<!-- Start of guardian embedded video -->

                    <!-- To prevent the video from auto playing set 'a=true' in the following line of code-->

                    <iframe src="http://gu-embedded-video.appspot.com/?a=false&u=/world/video/2012/aug/22/bonobo-apes-stone-tools-video" style="border:0; overflow:hidden;" scrolling="no" width="460px" height="397px"></iframe>

                    <!-- End of guardian embedded video -->