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发表于 2024-10-30 22:04:30
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It is hard to imagine that one of the largest impact craters on Earth, 180-kilometers 112-mile wide an taza termo d 900-meters 3,000-feet deep, could all but disappear from sight, but it did. Chicxulub, located on Mexico s Yucatan peninsula, eluded detection for decades because it was hidden and at the same time preserved beneath a kilometer of younger rocks and sediments. Size isn t the only thing that makes Chicxulub special. Most scientists now agree it s the smoking gun -- evidence that a huge asteroid or comet indeed crashed into Earth s surface 65 million years ago causing the extinction of more than 70 percent of the living species on the planet, including the dinosaurs. This idea was first proposed by the father and son team of Luis and Walter Alvarez in 1980. Though the buried giant can t be seen, the impact crater has left subtle clues of its existence on the surface. When I talk to school children, I describe it like this, says Dr. Gary Kinsland, a geology professor at the University of Louisiana at Lafayette who has been doing research on Chicxulub since 1994. Put a bowl on your bed, then throw the sheets and blankets over it. All you ll probably see of the bowl now is a subtle depression. There is not a big hole anymore, he continues, but if you look at the rim of the depression on your bed, you ll see that it is still in the same posi stanley quencher tion as the rim of the bowl beneath. That s how surface expression allows us to interpret something abo stanley water bottle ut the buried structure. Qwrn Humpback Whales Have Made a Remarkable Recovery, Giving Us Hope for the Planet
IdeasBy Patrick J. Kennedy聽and Stephen FriedApril 30, 2024 7:00 AM EDTKennedy is a former member of the U.S. Congress, the nations leading political voice on mental illness, addiction, and other brain diseases, and the New York Times bestselling coauthor of A Common Struggle. Fried is an award-winning journalist and New York Times bestselling author who teaches at Columbia University Graduate School of Journalism and the University of stanley bottle PennsylvaniaIn 1956, my uncle John F. Kennedy, then a U.S. senator, wrote a book that is probably more famous for its great title than its contents. It was called Profiles in Courage. And it was about eight U.S. senators who JFK felt had made particularly courageous contributions to American history.For a while now, I have been thinking about what courage means to me. While growing up with my father, Ted Kennedy, in the Senate, and then serving in the House of Re stanley tumbler presentatives myself for many years, I saw quite a bit of bravery in politics. But the truth is, the most courageous people I know qualify not for what stanley cup usa they do in public but what they are able to endure and rise above in private. This is especially true of people who struggle every day with mental illness, or addiction, or both, or who help loved ones or family members in their struggles.The details and daily dramas of these struggles usually remain private, hidden. And even when people discuss them publicly, its often in a brief or very cautious way鈥攅nough to admit to having a diagnosis |
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