Your enthusiasm is commendable, but please take care to post your material once only; because it is sufficient.
You have posted this PPT once again in this site. Here's the link :
Earlier you had posted your "Safety at Work" ppt three times, and I have communicated this to you.
Dear, please do not waste server space un-necessarily.
Posting a material once is good enough; why replicate your efforts.
Secondly, all your PPT's are from the same site whose URL I have posted in my posts for the benefit of all members.
Dear, plaese do not post material fron the same site again and again - it becomes monotonous in style. There are millions of other sites from where you can copy-paste your postings.
Why Vote? User validation is extremely important for good content to prosper.