A 3,000-year-old ceremonial gold mask has become an unexpected social media hit in China after its recent discovery in Sichuan province. The artefact was one of 500 Bronze-Age relics found at the Sanxingdui archaeological site. Experts say the discovery could provide new insights on the ancient Shu state, which ruled the area before 316 BC.

But the mysterious half-faced mask has also brought about a popular meme and memorable videos on social media. As soon as the latest group of discoveries was announced on Saturday, users of micro-blogging platform Weibo started making pictures combining the mask with the faces of pop culture figures. The comment “Sanxingdui gold mask photo editing competition” has been viewed nearly 4 million times, and has brought numerous posts as netizens praised the "stunning" and "beautiful" mask. Officials at the museum for Sanxingdui — one of the most important archaeological sites in China — soon joined in on the fun. "Good morning, we've just woken up, apparently everyone's been busy doing some Photoshopping?" the museum said in a recent Weibo post while sharing its own opinion about the meme. The museum also released a promotional animated music video starring the mask and other artefacts, while a rap song created by a TV host praising the ^intelligence⁹⁵ of the ancient civilisation has spread widely.

It is not the first time a Chinese artefact has attracted the attention of social media users — in August, another relic was found to resemble the pig characters in popular video game Angry Birds. In addition to the gold mask, archaeologists at Sanxingdui have found bronze pieces, gold foils as well as artefacts made from ivory, jade and silk. The items were uncovered in six "sacrificial pits", said the National Cultural Heritage Administration, which the Shu civilisation used to offer sacrifices in prayers for prosperity and peace.

The Sanxingdui ruins were discovered by accident by a farmer in 1929. To date, more than 50,000 relics have been unearthed at the site, which is around 60km from the city of Chengdu.

During World War I,countless soldiers were able to return home because of the protection provided by the heavy helmet.

A young officer in the U. S. Army witnessed the effectiveness of the helmet and realized its potential in a postwar industrial world. In 1919, Edward W.Bullard returned from the war to the family business,which was founded by his father Edward D. Bullard in 1898. He began developing ideas for affordable safety helmets that would protect miners. While the metal helmet was ideal for wartime conditions, it was not suitable for the mining industry. It was too big for miners to work underground and move through tight places. Plus, the cost was high So he chose to use a kind of heavy duck canvas（帆布), which was then formed to fit the human head with steam, thus named Hard Boiled Hat.He attached leather brims（帽檐） to it, and painted it black, so it would hold up to everyday wear in dirty, dangerous mines.

The hard hat was the first commercially available head protection device. Now worn by millions of workers, Bullard's hard hat revolutionized the safety-product industry, earning him a spot in the National Inventors Hall of Fame. At first, wearing a hard hat was a choice, not a requirement. That changed, however, during construction of the Hoover Dam, along the Colorado River in 1931. For the first time, employers required workers to wear hard hats.Now headquartered in Cynthiana, Kentucky,E. D. Bullard Co. is a leading manufacturer of high-quality personal protective equipment and systems worldwide, including a wide range of safety helmets. Edward W. Bullard has an eye on the future.The company plans to introduce a newline of Bullard hard hats for the industrial market.

Scientists recently discovered three tyrannosaur (霸王龙) trackways in Canada. The trackways suggest the meat eaters traveled and hunted in groups. The 70-million-year- old footprints are the first tyrannosaur trackways ever found.

Tyrannosaurs were a type of meat-eating dinosaur that included the strong Tyrannosaurus rex and Albertosaurus. “Groups of tyrannosaurs may have stuck together as a group to increase their chances of bringing down animals and individually surviving,” study coauthor Richard McCrea says. He works for Canada’s Peace Region Paleontology Research Centre. It’s believed that tyrannosaurs were solitary creatures. The newly discovered trackways could change the way scientists look at these frightening beasts.

Trackways can uncover a lot about the social behavior of a species. Unfortunately, very few tyrannosaur footprints have ever been found, and until recently, the only ones known were single prints discovered in Mongolia, the western U.S., and western Canada. But in October 2011, a hunting guide named Aaron Fredlund found two tyrannosaur track marks near Tumbler Ridge, an area in the foothills of the Canadian Rockies. Over the next year, McCrea and his team searched the site and found the remaining trackways.

The footprints are at about the same depth, which suggests the tyrannosaurs moved through the area at the same time. Impressions of the dinosaurs’ rough skin are even visible in the prints. The prints are also in near-perfect condition. That’s because the ground had a high clay (黏土 ) content when the dinosaurs walked through the area. The land was later covered by a thick layer of volcanic ash, which kept the marks intact (完整). “This is the most ideal situation you could ask for,” McCrea says.

Researchers aren’t sure of the exact species of tyrannosaur that left the prints. But the historic findings show a great deal about how the beasts moved and behaved. “We have extremely convincing evidence that tyrannosaurs traveled in groups,” says McCrea. “This is probably the most important evidence to come out to date on that topic.”