
From The Conversation: “The rings of Saturn are some of the most famous and spectacular objects in the Solar System. Earth may once have had something similar. In a paper published last week in Earth & Planetary Science Letters, my colleagues and I present evidence that Earth may have had a ring. Around 466 million years ago, a lot of meteorites started hitting Earth. We know this because many impact craters formed in a geologically brief period. In the same period we also find deposits of limestone across Europe, Russia and China containing very high levels of debris from a certain type of meteorite. The meteorite debris in these sedimentary rocks show signs that they were exposed to space radiation for much less time than we see in meteorites that fall today. Using models of how Earth’s tectonic plates moved in the past, we mapped out where all these craters were when they first formed. We found all of the craters are on continents that were close to the equator in this period.”
He decided to bring his Army friends some beers — when they were in Vietnam

From Now I Know: “In 1968, troops from the United States, South Vietnam, and Laos met the Viet Cong and the North Vietnamese in the Battle of Khe Sanh. There were nearly 100,000 combatants involved in the months-long skirmish, including 6,000 American Marines. Almost all of them were there to fight. But one of them, a Marine named Chickie Donohue, wasn’t. In fact, he wasn’t supposed to be there at all. He was just hoping to meet some friends and have a beer. In late 1967, Donohue was back in New York City, his hometown, drinking at a local bar. Antiwar protests had taken hold across the nation and the bartender — a former soldier named George “Colonel” Lynch (who was not, in fact, a colonel) wanted to do something to support the local boys serving in Vietnam. Half-jokingly, most likely, he suggested that someone should go to Vietnam and bring six of the bar’s regulars some beers. Donohue decided to turn the joke into reality.”
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