The largest bird in history has a wingspan of over six meters

Researchers at the National Evolutionary Complex in Durham, the United States, said that the analysis of a prehistoric seabird bones unearthed in South Carolina, the United States, indicates that this seabird may have been the largest bird in the history of the Earth,

with a wingspan between 6.1 meters and 7.4 meters, soaring several kilometers in the sky without a flap. The seabird has an average wingspan of about 6.4 meters, surpassing the previous record holder,

the long-extinct Argentine giant eagle, and twice the wingspan of the royal albatross, the largest living bird on Earth.

The fossil was discovered in 1983 during excavations for the construction of a new terminal at Charleston International Airport in South Carolina and includes wing bones, leg bones and a complete bird head.

Based on the bird's large body size and sharp bone teeth on the upper and lower jaws, scientists determined that it belonged to the Pseudornithidae, an extinct prehistoric giant seabird estimated to have lived between 28 million and 25 million years ago,

when the Earth's dinosaurs were extinct, but the first humans had not yet appeared in the Americas. Its thin and hollow skeleton, short leg bones and large wings led researchers to believe that the giant bird could soar easily in the air, but was clumsy on the ground.

The model suggests that this bird may be like the Argentine giant eagle, because of its size, it may not be able to fly by flapping its wings alone, but it is running down the slope and riding the wind, similar to the principle of human gliders.

The sea beneath Titan could be as salty as the Dead Sea

The ocean beneath Saturn's largest moon, Titan, may be as salty as Earth's Dead Sea, indicating it may not be hospitable to life, NASA said. Using gravitational and topographic data from Cassini's flybys of Titan over the past decade,

researchers have mapped out a model of the moon's structure, including the location of its outer icy shell and its inner ocean. Models suggest that the water beneath Titan's surface is relatively dense.

This means that seawater contains a lot of salt, probably made up of sulfur, sodium, and potassium. Overall, the sea beneath Titan is as salty as the Dead Sea, the saltiest lagoon on Earth.

In addition, studies have shown that Titan's shell varies in thickness from place to place. The best explanation, the researchers say, is that Titan's subsurface water is slowly crystallizing into ice,

creating a hard outer ice shell that would otherwise have a uniform thickness. However, the hard shell limits material exchange between Titan's surface and the subsurface sea, meaning that the subsurface sea may not be hospitable to life.

Voyager 1 was confirmed to have entered interstellar space

The US space agency NASA says newly obtained data shows that the Voyager 1 probe has indeed entered the cold and dark of interstellar space. Interstellar space is the region between stars filled with a thin layer of charged particles called plasma.

According to the latest news, since entering interstellar space, Voyager 1 has recorded three "solar wind tsunamis" caused by the sun's coronal mass ejections, the first of which was small, so it took a while to be noticed by researchers;

The second was clearly "sensed" by instruments aboard Voyager 1 in March 2013, and the results showed that the plasma density of the probe's location was more than 40 times that of the heliosphere, suggesting that it had entered interstellar space.

In March this year, Voyager 1 recorded the "solar wind tsunami" for the third time, and the plasma density calculated from the measured plasma oscillation data was similar to the second time, confirming that Voyager 1 was indeed sailing in interstellar space.Zheng Haoli: Happiness can be measured by data

Happiness is an eternal topic that people can not finish discussing. In the words of Wilkins Micawber, "Happiness is 20 pounds a year and 19 pounds 19 shillings and 6 pence a year." To earn twenty pounds a year,and spend twenty pounds and a penny a year, is misfortune.

'Whether it was Aristotle looking up at the stars in ancient Greece, Rousseau living alone in the French countryside, Bentham reading Hume's works in Oxford University, or Confucius traveling around the world in China,

Lao-tzu who "left the sun without a place to go", happiness has long been thought and speculated by ancient and modern philosophers at home and abroad countless times, and gave their own answers.