"Chiquihuite's main contribution is that it brings you another tiny light, another tiny signal, that there is something there," the paper’s lead author Ciprian Ardelean, an archaeologist with the Autonomous University of Zacatecas, told National Geographic in July. Yet no human remains have yet been found, and the new study is stirring controversy among scientists. Studying the cave suggests it could have been hospitable tens of thousands of years ago, as the region was likely much cooler, wetter, and greener than it is today. And the new analysis of stone artifacts, including blades, projectile points, and rock flakes, interspersed with bits of charcoal dated to some 30,000 years old, suggests humans likely arrived in the Americas before glaciers began to melt. But recent evidence has pushed the date of human arrival back by thousands of years. This date is hotly debated among archaeologists, with many initially placing the first human presence in the Americas at around 13,500 years ago, as ice sheets receded and migration routes from Asia opened up. Stone objects recovered from deep inside the Chiquihuite Cave in Mexico hint that humans may have arrived in the Americas as early as 30,000 years ago-roughly twice the age of most current arrival estimates. Surprise cave discoveries may push back people’s arrival in the Americas “Viruses do not take breaks.” Another outbreak (now contained) occurred in early June near the DRC’s Équateur Province. “We should celebrate this moment, but we must resist complacency,” WHO Director-General Tedros Adhanom Ghebreyesus said in a press release about the end of the outbreak. By also improving community engagement, this effort led to the vaccination of more than 300,000 people. However, armed with a new vaccine, healthcare workers, led by Michael Yao of the WHO, launched a campaign to vaccinate anyone who may have been exposed. Containing the disease in Kivu was particularly difficult due to local unrest, which led to suspicions about any government or international organization efforts to curb the disease’s spread. Ebola is a hemorrhagic fever marked by a host of symptoms-including bleeding, fever, stomach pains, weakness, and rashes-and is spread through direct contact with an infected person or animal’s blood or bodily fluids. Known as the Kivu outbreak, the event began in August 2018 with a cluster of cases near Kivu, in eastern Democratic Republic of the Congo. On June 25, the World Health Organization declared the end of the second largest Ebola outbreak, which infected more than 3,480 and killed nearly 2,300. The second-largest Ebola outbreak is finally over While only a single meal, the find provides an exceptional look at the final hours of a creature's life more than a hundred million years ago. Rings of woody twigs eaten along with the ferns revealed that the nodosaur likely died during the summer. The ball of fossilized vegetation from the nodosaur’s stomach revealed that a few hours before its death, it largely munched on a specific type of fern selected from a variety of available plantlife. The dinosaur was a nodosaur, which is a type of ankylosaur but lacks the clubbed tail of some of its cousins. But this year, the spiky creature served up even more excitement when an analysis revealed that the animal’s last meal was also preserved in its belly. The brilliantly preserved front half of a 110-million-year-old armored dinosaur-bony plates, scales, and all-surprised and delighted scientists after it was accidentally unearthed in 2011 by a heavy equipment operator working in an Alberta oil sands mine. Stunning details of an armored dinosaur’s last meal “It’s extremely puzzling,” Bruce Banerdt, the principal investigator of the InSight mission, told National Geographic in February.
Perhaps the geology underneath the lander amplifies one particular tone, or the lander itself might even be generating the noise. But the music of Mars reverberates at a higher pitch than most natural hums on Earth. Earth has many such background vibrations, from the roar of winds to the crashing of waves against the shore. Among these curiosities is a Martian hum- a quiet, constant drone that seems to pulse to the beat of “marsquakes” that rattle the planet. Known as the InSight lander, the robotic geologist recently beamed some of its early findings back to Earth, exciting and perplexing scientists around the world. In November 2018, a spacecraft arrived on Mars’s frigid, dusty surface to take the planet’s pulse. Mars is humming, and scientists aren’t sure why
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