D Scientists have discovered some of the oldest stone tools ever found at a research site (遗 ) in Kenya. But the find created a mystery Which group of early humans made and used the tools? A study suggests early humans used tools to cut up anmals for food about 3 million years ago ...
WASHINGTON(AP)-Astronomersbelieve they’ve found the oldest thing they’ve ever seen in the universe:It’s a galaxy(星系)far, far away from a time long, long ago. Hidden in a Hubble Space Telescope photo released earlier this year is a small point of light that Europeanastronomers now cal...
Biggest, oldest Mayan monument ever foundMichael Marshall
Use of cookies/Do not sell my data Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www.springernature.com/us). Scientific American maintains a strict policy of editorial independen...
Archaeologists uncovered a 480-year-old gun in Arizona. It’s now considered the oldest firearm ever found within the continental United States.
written apparently between the sixth and early seventh centuries in China was confirmed in Japan, a discovery one scholar described as “invaluable.” It is believed to be one of the oldest of any religious teaching written on paper, except for those of Buddhist scriptures, found in the ...
题型:语法填空-单句语填难度:0.94引用次数:4题号:23389778 It is the oldest of its type ever found. They also found a wealth of iron tools and weapons, providing new insight___the period when iron tools first began to appear. (用适当的词填空) 2025高三...
OldestfossilseverfoundshowlifeonEarthbegan... The study, published today in theProceedings of the National Academy of Sciences, was led by J. William Schopf, professor of paleobiology at UCLA, and John W. Valley, professor of geoscience at the University of Wisconsin-Madison. The research relied...
Permian-period petroleum helped to preserve minute scraps of pebbly hide that probably belonged to a lizard-like creature.
Until now, the oldest DNA ever recovered belonged to a horse, dating from 780,000 to 560,000 years ago.