单词:zombas
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Kristin,, my 17-year-old niece, had just gotten her driver's license and offered to take her mom's car to the gas station. She pulled up to the full-service pumps, and the attendant asked,
A first grade teacher was having trouble with one ofher students. One day she asked Johnny what his problem was. He replied, I'm too smart for the first grade, my sister is in the third grade and I'm smarter than her . The teacher took him to the pri
This is Scientific Americans 60-Second Science. Im Sophie Bushwick. Got a Minute? What's the best way to find out if an unknown mixture contains a specific substance, like an environmental contaminant? You could use an expensive, bulky gas chromatogr
What Grade Kristin,, my 17-year-old niece, had just gotten her driver's license and offered to take her mom's car to the gas station. She pulled up to the full-service pumps, and the attendant asked, What grade, miss?Eleventh! Kristin replied. Notes:
Indoor air pollution is a common threat to human health, the new study looked at five common house plants and found that when it comes to removing harmful chemicals from the air, those five plants are better than others. 室内空气污染对人类健康
本期内容: A humble houseplant with a dash of rabbit DNA could help lower our exposure to indoor air pollution, new research suggests. Scientists have revealed that by inserting a rabbit gene into devils ivy the plant is able to clean the surrou