Why do you think repetition is such an effective technique in public speeches

I think that repetition is an effective technique to use in public speeches because people could forget what you said just a minute ago, focusing on the now. Therefore you repeating what you had said, to emphasis one what your trying to portray.

the best practice

1. keep your workspace clean

2. wash your hands

3. seperate and clean chemicals and equipment

4.   use microfiber cleaning utensils

5. clean and sanitize all work surfaces

hope this !