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A Google-a-Day Puzzle for August 5 By Ken Denmead 08.05.12 Our good friends at Google run a daily puzzle challenge and asked us to help get them out to the geeky masses. Each day’s puzzle will task your googling skills a little more, leading you to Google mastery. Each morning at 12:01 a.m.Eastern time you’ll seea new puzzle, and theprevious day’s answer(in invisitext) posted here. SPOILER WARNING: We leave the comments on so people can work together to find the answer. As such, if youwant to figure it out all by yourself, DON’T READ THE COMMENTS! Also, with the knowledge that because others may publish their answers before you do, if you want to be able to search for informationwithout accidentally seeing the answer somewhere, you can use the Google-a-Day site’s search tool , which will automatically filter out published answers, to give you aspoiler-free experience. And now, without further ado, we give you… TODAY’S PUZZLE: The first U.S. construction site that required workers to wear a particular safety item was the Hoover Dam. What was the safety item and which site was the second to require it? YESTERDAY’S ANSWER(mouseover to see): Search [first woman U.S. postage stamp] to find that Queen Isabella of Spain appeared on a stamp in 1893. Use Google Translate to learn that “stamp” is“sello” (or “estampilla”) in Spanish. Ken is a husband and father from the San Francisco Bay Area, where he works as a civil engineer. He also wrote the NYT bestselling book"Geek Dad: Awesomely Geeky Projects for Dads and Kids to Share."