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Where can you see a palm tree grown from a seed more than two thousand years old? Detailed answer

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Where can you see a palm tree grown from a seed more than two thousand years old?

Since ancient times, Judea has been famous for a special variety of date palms, which provided food, wood, medicines and the opportunity to rest in the shade. But from about the 14th century, due to economic decline in the region and climate change, the cultivation of Judean date palms was brought to naught.

In the 1960s, during the excavations of the palace of King Herod, archaeologists found a pot with seeds of this palm tree over two thousand years old, and already in the 21st century, a group of Israeli scientists undertook to grow trees from them. Three seeds were kept in special solutions and fertilizers and planted in the soil, where one of them managed to germinate.

Now the palm tree, which was dubbed Methuselah, is over two meters high and feels great.

Authors: Jimmy Wales, Larry Sanger

 Random interesting fact from the Great Encyclopedia:

Who managed to cross the Atlantic Ocean on foot and tried to cross the Pacific?

In 1988, Frenchman Remy Brikat crossed the Atlantic Ocean on foot. Five-meter fiberglass pontoons were tied to his feet, he helped himself only with an oar, and behind him pulled a raft with equipment, a desalination plant and fishing accessories. Starting from the Canary Islands, the traveler wanted to reach Guadeloupe, but, emaciated and hallucinating, was picked up by a trawler near Trinidad - nevertheless, the Guinness Book of Records credited him with a record. In 2000, Brika set an even more ambitious goal - to pass the Pacific Ocean from Los Angeles to Sydney in the same way. However, he had to ask for help and end the journey 500 miles south of Hawaii ahead of schedule, as a severe storm capsized the raft and damaged navigational equipment.

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Photonic chip converting waves with high efficiency 27.04.2021

American scientists have created a photonic chip capable of effectively changing the frequency of the incoming signal and amplifying it at the output using nonlinear optical effects.

Coherent frequency conversion has many applications in the field of classical and quantum information transmission, visualization and detection. This process is crucial for the connection between classical and quantum devices - as a result of it, the frequency of the signal changes, but the initial phase and envelope of the wave remain the same.

The authors of the new study have created photonic chips that can efficiently convert incoming frequencies using non-linear optical effects. Photonic devices were chosen for a reason - they consume low power, scale well and have a small size. In addition, optical effects that are not available for other platforms are possible in such chips.

Physicists have presented a new circuit for highly efficient frequency conversion on a photonic chip. When generating the sum frequency - a non-linear optical process that can convert the frequency of the incoming signal - the device uses only the phase matching condition for the two modes. This significantly increases the speed and reduces the complexity of the process.

Experiments have shown that the highest efficiency was observed for converting a signal with a frequency of 1560 nanometers into a wave with a frequency of 780 nanometers. The efficiency rate was 42% - higher than for many modern devices. By creating cascade optical effects in the chip, the authors were able to increase this value to almost 100%.

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