| The Long and Winding Road: DNA Evidence for Human Migration; Plus July Issue Highlights Gary Stix discusses his July Scientific American cover article on DNA evidence for the history of human migration. And editor in chief, John Rennie, talks about the neuroscience of dance, the quantum cosmos and Rubik's Cubes. Plus, we'll test your knowledge of some recent science in the news. Web sites mentioned on this episode include www.sciam.com/sciammagPodcast Transcription [More] feeds.feedburner.com |
The Tunguska Mystery--100 Years Later Editor's Note: This story was originally printed in the June 2008 issue of Scientific American.June 30, 1908, 7:14 a.m., central Siberia--Semen Semenov, a local farmer, saw “the sky split in two. Fire appeared high and wide over the forest.... From ... where the fire was, came strong heat.... Then the sky shut closed, and a strong thump sounded, and I was thrown a few yards.... After that such noise came, as if . . . cannons were firing, the earth shook ...” [More] feeds.feedburner.com |
Levi Strauss and Jacob Davis receive patent for blue jeans On this day in 1873, San Francisco businessman Levi Strauss and Reno, Nevada, tailor Jacob Davis are given a patent to create work pants reinforced with metal rivets, marking the birth of one of the world's most famous garments: blue jeans.Born Loeb Strauss in Buttenheim, Bavaria, in 1829, the young Strauss immigrated to New York with his family in 1847 after the death of his father. By 1850, Loeb had changed his name to Levi and was working in the family dry goods business, J. Strauss Brother & Co. In early 1853, Levi Strauss went west to seek his fortune during the heady days of the Gold Rush.In San Francisco, Strauss established a wholesale dry goods business under his own name and worked as the West Coast representative of his family's firm. His new business imported clothing, fabric and other dry goods to sell in the small stores opening all over California and other Western states to supply the rapidly expanding communities of gold miners and other settlers. By 1866, Strauss had moved his company to expanded headquarters and was a well-known businessman and supporter of the Jewish community in San Francisco.Jacob Davis, a tailor in Reno, Nevada, was one of Levi Strauss' regular customers. In 1872, he wrote a letter to Strauss about his method of making work pants with metal rivets on the stress points--at the corners of the pockets and the base of the button fly--to make them stronger. As Davis didn't have the money for the necessary paperwork, he suggested that Strauss provide the funds and that the two men get the patent together. Strauss agreed enthusiastically, and the patent for "Improvement in Fastening Pocket-Openings"--the innovation that would produce blue jeans as we know them--was granted to both men on May 20, 1873.Strauss brought Davis to San Francisco to oversee the first manufacturing facility for "waist overalls," as the original jeans were known. At first they employed seamstresses working out of their homes, but by the 1880s, Strauss had opened his own factory. The famous 501 brand jean--known until 1890 as "XX"--was soon a bestseller, and the company grew quickly. By the 1920s, Levi's denim waist overalls were the top-selling men's work pant in the United States. As decades passed, the craze only grew, and now blue jeans are worn by men and women, young and old, around the world. history.com |
Hostage crisis in Moscow theater On October 23, 2002, about 50 Chechen rebels storm a Moscow theater, taking up to 700 people hostage during a sold-out performance of a popular musical.The second act of the musical "Nord Ost" was just beginning at the Moscow Ball-Bearing Plant's Palace of Culture when an armed man walked onstage and fired a machine gun into the air. The terrorists—including a number of women with explosives strapped to their bodies—identified themselves as members of the Chechen Army. They had one demand: that Russian military forces begin an immediate and complete withdrawal from Chechnya, the war-torn region located north of the Caucasus Mountains.Chechnya, with its predominately Muslim population, had long struggled to assert its independence. A disastrous two-year war ended in 1996, but Russian forces returned to the region just three years later after Russian authorities blamed Chechens for a series of bombings in Russia. In 2000, President Vladimir Putin was elected partly because of his hard-line position towards Chechnya and his public vow not to negotiate with terrorists.After a 57-hour-standoff at the Palace of Culture, during which two hostages were killed, Russian special forces surrounded and raided the theater on the morning of October 26. Later it was revealed that they had pumped a powerful narcotic gas into the building, knocking nearly all of the terrorists and hostages unconscious before breaking into the walls and roof and entering through underground sewage tunnels. Most of the guerrillas and 120 hostages were killed during the raid. Security forces were later forced to defend the decision to use the dangerous gas, saying that only a complete surprise attack could have disarmed the terrorists before they had time to detonate their explosives.After the theater crisis, Putin's government clamped down even harder on Chechnya, drawing accusations of kidnapping, torture and other atrocities. In response, Chechen rebels continued their terrorist attacks on Russian soil, including an alleged suicide bombing in a Moscow subway in February 2004 and another major hostage crisis at a Beslan school that September. history.com |
New York City subway opens At 2:35 on the afternoon of October 27, 1904, New York City Mayor George McClellan takes the controls on the inaugural run of the city's innovative new rapid transit system: the subway.While London boasts the world's oldest underground train network (opened in 1863) and Boston built the first subway in the United States in 1897, the New York City subway soon became the largest American system. The first line, operated by the Interborough Rapid Transit Company (IRT), traveled 9.1 miles through 28 stations. Running from City Hall in lower Manhattan to Grand Central Terminal in midtown, and then heading west along 42nd Street to Times Square, the line finished by zipping north, all the way to 145th Street and Broadway in Harlem. On opening day, Mayor McClellan so enjoyed his stint as engineer that he stayed at the controls all the way from City Hall to 103rd Street. At 7 p.m. that evening, the subway opened to the general public, and more than 100,000 people paid a nickel each to take their first ride under Manhattan. IRT service expanded to the Bronx in 1905, to Brooklyn in 1908 and to Queens in 1915. Since 1968, the subway has been controlled by the Metropolitan Transport Authority (MTA). The system now has 26 lines and 468 stations in operation; the longest line, the 8th Avenue "A" Express train, stretches more than 32 miles, from the northern tip of Manhattan to the far southeast corner of Queens.Every day, some 4.5 million passengers take the subway in New York. With the exception of the PATH train connecting New York with New Jersey and some parts of Chicago's elevated train system, New York's subway is the only rapid transit system in the world that runs 24 hours a day, seven days a week. No matter how crowded or dirty, the subway is one New York City institution few New Yorkers—or tourists—could do without. history.com |