Vocabulary
quantum – 量子;
mechanics – 力学;
septillion – 10垓（がい）; 10の24乗（非常に大きな数）;
Nvidia – エヌビディア; 世界的な半導体企業で、特にGPU（グラフィックス処理装置）で有名;
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Quantum computing is a new technology that uses quantum mechanics to solve very difficult problems. It is much more powerful than regular computers. For example, Google showed a quantum chip that solved a problem in just five minutes, while the world’s fastest supercomputer would take 10 septillion years to do the same task.

However, quantum computers are not ready for everyday use yet. They are very expensive and difficult to build. Scientists need to improve both the hardware and software before they become useful.

Experts have different ideas about when quantum computers will be ready. Some believe we will see 5,000 quantum computers by 2030, but useful ones may not come until 2035 or later. Nvidia’s CEO thinks they will be ready in 2045, but Microsoft believes they may come much sooner.

Quantum computing is growing fast, but we still need time before it becomes part of our daily lives.
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Notes
Winter Solstice 冬至;
Northern Hemisphere 北半球;
yuzu bath 柚子湯;
fragrant 香りのよい、芳しい;
southernmost 最南端の;
kabocha squash 南瓜);

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Today is the Winter Solstice , the shortest day and longest night of the year. In the Northern Hemisphere, this day usually falls on December 21st or 22nd.

In Matsue City, Japan, the sun rises at 7:08 AM and sets at 4:54 PM, providing about 9 hours and 46 minutes of daylight. This happens because the sun reaches its southernmost point in the sky, marking the official start of winter.

Even with the long night, Japan’s traditions bring warmth and comfort to this day. Many people take a yuzu bath, adding fragrant yuzu citrus fruits to hot water. This tradition is believed to prevent colds and keep the body warm during the chilly season.

Another cherished custom is eating kabocha squash. This bright, hearty vegetable symbolizes health and good fortune. It’s also considered a source of strength for the cold winter months ahead.

These simple yet meaningful traditions bring families together. The Winter Solstice serves as a gentle reminder to pause, reflect, and appreciate moments of warmth and togetherness.
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