A new song by the famous band The Beatles has been released despite half of the band members no longer being alive, thanks to the help of AI.

The Beatles was a legendary British rock band that remained second to Elvis Presley from the 1960s. It was made up of four musicians—John Lennon, Paul McCartney, George Harrison and Ringo Starr. The new song, titled Now and Then, is unique because it combined the singing of McCartney and Starr with Lennon, who passed away in 1980, and the guitar skills of Harrison, who passed away in 2001.

The song was initially written and partly recorded by Lennon in the late 1970s and further developed by band mates years later but as technology then was limited, they didn’t release it due to the sound quality not being satisfying.

Peter Jackson, most famous for directing The Lord of the Rings, directed the music video for Norw and Then and it can be watched now online. It was thanks to new Al audio restoration (音频修复) technology that Peter Jackson allowed the four band members to “come together” one last time.

Since its release last week, the song has been well received in the UK. Beatles fans around the world favoured this historic musical event.

”Now and Then is an absolutely heart-warming piece of work, “posted Liam Gallagher, whose hits were affected by The Beatles’ musical style.

Of course, there are those who are not totally interested in the song. ”Now and Then is not terrible. But honestly, it’s kind of boring, “Geoff Edgers wrote in The Washington Post.

The Times in the UK said the song showed Al being used to its best advantage.

In 2017, AlphaGo defeated Chinese player Ke Jie to become the world’s No 1, ending thousands of years of human dominance（控制）in the game. AlphaGo is an artificial intelligence（AI）Go-playing program.【小题1】

Artificial intelligence（AI）is usually defined as the science of marking computers do things that require intelligence when done by humans.【小题2】These include learning, reasoning, problem-solving, perception, and language-understanding.

【小题3】In fact we are increasingly depending. upon computer-based artificial intelligence. As Charlie Qrtiz said, head of AL at the Massachusetts-based software company Nuance Communication, “It has opened a window for us.”Smartphones, self-driving cars, intelligent robots，etc. are constantly coming into our life. According to a recent survey, half of the world’s AI experts believe human level machine intelligence will be achieved by 2040. This will open up huge possibilities for the enrichment of mankind, from tackling climate change and treating disease to labour- saving devices.

【小题4】Physicist Stephen Hawking last year warned that unless we take care, board games might be the least of it. “The development of full artificial intelligence could mean the end of the human race.”【小题5】They believe AlphaGo’s victory is a reminder of how fast the world is overcoming the obstacles in the way of AI, and its distribution in the world about us. Although there may yet be no evidence that computers will ever shake off their human masters, we should still treat these development with the humility and caution they deserve.

However exciting space exploration sounds, there’s a necessary and important point about it that needs to be considered: food supplies. Right now, astronauts typically rely on dry food in airtight bags and cans，since there are strict weight limits on items taken into space. Foods that we take for granted, such as fresh fruits and vegetables, are out of the question for space explorers.

For those who’ve made an effort to try to grow food during space flights, they’ve faced many difficulties, including the absence of gravity, and a lack of soil, air and humidity (湿度). However, growing food to add and minimize (最小化) the food that must be carried to space will be increasingly important on long-duration flights into space. Great efforts have been made to explore the concept (idea) of space farming. Recently, a team led by Federico Maggi at the University of Sydney in Australia have worked out how plants can absorb nutrients from human urine (尿), as was reported by New Scientist on March 27.

After over 20 years of experiments, the results suggested that human urine could supply three to four out of the six nutrients that plants need. The researchers also found out that urine-fertilized plants produce no harmful by-products, such as carbon dioxide or ammonia.

According to New Scientist, human urine is 95 percent water, with the other 5 percent made from nutrients which are harmful to the human body but not to plants. The advantage of this urine-fueled life support system is obvious: By recycling liquid waste and producing food, an efficient cycle will be created.

And most importantly, said New Scientist，the duration of space flights will be greatly extended to “20 years of flight”, meaning we may be soon sending astronauts on flights to Mars, or even beyond.