An ice age has been blamed for the extinctions - a huge ice sheet in the southern hemisphere caused climate change and a fall in sea level, and messed with the chemistry of the oceans.
Ice cream makers nationwide are using food chemistry to transform this favorite dessert into a funkier, high-tech, customizable indulgence.
全美的冰淇淋制造商正在运用食品化学把这种人见人爱的甜品变成一种时髦的，高科技的，可定制的美味。
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One of my key challenges is figuring out how best to detect, characterize, and map complex organic chemistry out there in the solar system to see if Europa’s ice-covered ocean is, in fact, inhabited.