When applied properly, an SPF 15 filters out 93 percent of UVB, SPF 30 filters 97 percent and SPF 50 filters 98 percent. SPF 15 is good enough. According to The Skin Cancer Foundation, most sunscreens with an SPF of 15 or higher do an excellent job of protecting against UVB.PF10-15 is good enough for me as my skin is allergic to higher SPF for you need to add chemicals onto the product in order to achieve a higher SPF.
TEXTBOOK AND COURSE BOOK POLICY. Desk copies | Course use examination copies | Ordering | Course adopted books as electronic downloads . Desk Copies. Desk copies are complimentary books sent to professors who have already adopted the book for a course. To request a desk copy, professors can send an e-mail to our customer service vendor, the Chicago Distribution Center (CDC), at orders@press.uchicago.edu.
Best Answer: soft copy means an electronic version of the document, hard copy is a printed version. Soft Copy is nothing but the file or the copy that you have stored in your computer system and share with others through system. Soft copy is that information shown on the screen of your monitor. Hard copy is that physical copy of the document. Soft copy is a copy which you can read only on computer which you can not see otherwise. Hard copy is a print out which you can see physically. In your computer all documents is in form od soft copy you can edit and save. But hard copy is printer document on paper, you can not modify it.