Paleontologists have traced the origins of humans and other vertebrates to a worm that swam in the oceans half a billion years ago, said a study published on Monday.
A new analysis of fossils unearthed in the Canadian Rockies determined that the extinct Pikaia gracilens is the most primitive known member of the chordate family, which today includes fish, amphibians, birds, reptiles and mammals.
The research published in the British scientific journal Biological Reviews identified a notochord or rod that would become part of the backbone in vertebrates, and skeletal muscle tissue called myomeres in 114 fossil specimens of the creature.
“The discovery of myomeres is the smoking gun that we have long been seeking,” said the study’s lead author, Simon Conway Morris of Cambridge University.
“So, next time we put the family photograph on the mantle-piece, there in the background will be Pikaia,” he said.
The Chinese People’s Liberation Army (PLA) is constructing a new counter-stealth radar system on a disputed reef in the South China Sea that would significantly expand its surveillance capabilities in the region, satellite imagery suggests. Analysis by London-based think tank Chatham House suggests China is upgrading its outpost on Triton Island (Jhongjian Island, 中建島) on the southwest corner of the Paracel Islands (Xisha Islands, 西沙群島), building what might be a launching point for an anti-ship missile battery and sophisticated radar system. “By constraining the US ability to operate stealth aircraft, and threaten stealth aircraft, these capabilities in the South China Sea send
HAVANA: Repeated blackouts have left residents of the Cuban capital concerned about food, water supply and the nation’s future, but so far, there have been few protests Maria Elena Cardenas, 76, lives in a municipal shelter on Amargura Street in Havana’s colonial old town. The building has an elegant past, but for the last few days Maria has been cooking with sticks she had found on the street. “You know, we Cubans manage the best we can,” she said. She lives in the shelter because her home collapsed, a regular occurrence in the poorest, oldest parts of the beautiful city. Cuba’s government has spent the last days attempting to get the island’s national grid functioning after repeated island-wide blackouts. Without power, sleep becomes difficult in the heat, food
Botswana is this week holding a presidential election energized by a campaign by one previous head-of-state to unseat his handpicked successor whose first term has seen rising discontent amid a downturn in the diamond-dependent economy. The charismatic Ian Khama dramatically returned from self-exile six weeks ago determined to undo what he has called a “mistake” in handing over in 2018 to Botswanan President Mokgweetsi Masisi, who seeks re-election tomorrow. While he cannot run as president again having served two terms, Khama has worked his influence and standing to support the opposition in the southern African country of 2.6 million people. “The return of
Ukrainian President Volodymyr Zelenskiy has rejected a plan for the UN Secretary-General Antonio Guterres to visit Kyiv due to Guterres’ attendance at this week’s BRICS summit in Russia, a Ukrainian official said on Friday. Kyiv was enraged by Guterres’ appearance at the event in the city of Kazan on Thursday and his handshake with its host, Russian President Vladimir Putin, whose forces invaded Ukraine on Feb. 24, 2022. Guterres, who called for a “just peace” in Ukraine at the BRICS event and has repeatedly condemned the invasion, discussed a visit to Ukraine with Zelenskiy when they met in New York
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