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Is there a new kilogram? Yes and no. A kilogram is still 1,000 grams, but how do you know if a kilogram in your country weighs as much as a kilogram in another country? In the late 1800s, a group of countries agreed to use a standard weight. They made a perfect kilogram and called it “Le Grand K.” They kept it in Paris. It became the standard, and other countries made copies from it. There was a problem, however. Somehow, the weight of Le Grand K changed. Now scientists have found a new way to measure a kilogram. They don’t need Le Grand K any more. There is a new kilogram. (by Prof. Douglas Jarrell)
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Notes:
chestnut tiger アサギマダラ
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The autumn has been warm recently, so it is difficult to know what to wear. You can see some people in sweaters and jackets. Others are still wearing lighter clothes. The leaves on the trees in the city streets have started to change color, but they don’t seem as beautiful this year. The warm weather has also brought back butterflies. On a sunny day, you can see them flying around looking for flowers. Why are they still here? Some butterflies like the chestnut tiger fly south for the winter, but the butterflies we are seeing now usually sleep in winter. (by Prof. Douglas Jarrell)
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