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科學(xué)60秒:牡蠣味鮮美 環(huán)保價(jià)更高
The Chesapeake Bay could get helped by a new antipollution expert: farmed oysters. For decades, the Chesapeake has been ___1___ by excess nutrients, such as nitrogen, from agricultural and munici...
科學(xué)60秒:醫(yī)生昏昏欲睡 手術(shù)患者擔(dān)責(zé)
Over the years ____1____ limit the hours of hospital interns and residents. Because someone putting in a 100-hour workweek might not be at their best when deciding which medication to prescribe o...
太陽能熱水器 (1)
AfghanistanSolar water heaters are devices that use energy from the sun to heat water. Solar water heating is used around the world. The solar water heater described here is based on a design de...
金融次貸危機(jī)波及全球銀行 (1)
Sweden SwitzerlandThis week, economic worries turned from inflation. On Wednesday, central banks in nations around the world acted together to lower interest rates. The fear is that a lack of cr...