Livescience Why Is the Flag at Half-Staff Until Noon on Memorial Day? 2017-05-29T08:40:00.000000000-04:00 On Memorial Day, when the U.S. honors its war dead, a whole new set of rules govern raising and lowering of the American flag. JFK at 100: The Science of Kennedy's Popularity 2017-05-29T07:55:00.000000000-04:00 John Fitzgerald Kennedy consistently ranks as one of America's most popular leaders. A presidential historian argues that didn't just happen – it was the result of an effort to create an image. Early Collapse of Arctic Sea Ice Is Another Ominous Sign of Rapid Warming 2017-05-28T08:11:00.000000000-04:00 The Arctic is warming twice as fast as the lower latitudes, and scientists report sea ice across the Nares Strait just collapsed two months earlier than normal. How Would Engineers Build the Golden Gate Bridge Today? 2017-05-28T07:56:00.000000000-04:00 It's been 80 years since this beloved landmark opened to San Francisco traffic. In the interim, technology has advanced – is there a better way to span this strait? Best Outdoor Activities for Staying in Shape in 2017 2017-05-27T12:12:00.000000000-04:00 If you still need to get in shape this year, don't fret — the balmy days of summer provide a great opportunity for exercising outdoors. Why Do Men Run Faster Than Women? 2017-05-27T04:10:00.000000000-04:00 Why is it that male runners tend to clock faster times than female runners do? Less Invasive Autopsy Should Be Standard Practice, Study Says 2017-05-26T12:45:00.000000000-04:00 A new, less invasive method of conducting autopsies could one day replace the traditional procedure for diagnosing the causes of many deaths, according to a new study. Kind of Blue: Beautiful Algae Images in Rare 19th-Century Book (Photos) 2017-05-26T12:43:00.000000000-04:00 Nineteenth-century cyanotypes — an early form of photography — capture the delicate beauty of British algae. Can a Woman's Heart Rate Show When She's Fertile? 2017-05-26T12:12:00.000000000-04:00 A woman's heart rate appears to increase slightly when she's at the most fertile point in her menstrual cycle. Spray-On Touch Screens? How to Turn Any Flat Surface into a Touchpad 2017-05-26T11:47:00.000000000-04:00 With just a can of spray paint, researchers can turn flat surfaces of any shape or size into touchpads.