今天白天晴转多云，北转南风二三级，最高气温6℃。今起三天以晴到多云天气为主，午间较适宜户外活动，早晚气温低，体感寒冷，请注意防寒保暖；近期天干物燥，需注意补水保湿和用火用电用气安全。新京报记者 王景曦SourcePh" style="display:none"
Scientists warn that the debris is congesting space and threatens collision with rockets, the International Space Station, and our planet.
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The Secret History of Knocking on WoodMost of human nature is never written down — and machines can't learn it from text
Microbiologists have been growing microbes on agar plates for nearly 150 years, but agar’s discovery dates back to a happy accident in a mid-17th-century kitchen. Legend has it that on a cold winter day, a Japanese innkeeper cooked tokoroten soup, a Chinese agar seaweed recipe known in Japan for centuries. After the meal, the innkeeper discarded the leftovers outside and noticed the next morning that the sun had turned the defrosting jelly into a porous mass. Intrigued, the innkeeper was said to have boiled the substance again, reconstituting the jelly. Since this discovery, agar has become a staple in many Japanese desserts, from yokan to anmitsu.