The ball-point pen example had to be retired a few months ago: http://www.chinadaily.com.cn/china/2017-01/10/content_27914009.htm http://www.chinadaily.com.cn/c

The ball-point pen example had to be retired a few months ago: http://www.chinadaily.com.cn/china/2017-01/10/content_27914009.htm http://www.chinadaily.com.cn/china/2017-01/10/content_279140...