Ice cover takes deep dip on Great Lakes

Icy, snow-covered lakes are a normal part of Midwest winters, but Great Lakes ice cover is taking a big dip this year in Michigan and other states, weather experts say.

NASA's ECOSTRESS mission sees plants 'waking up' from space

Although plants don't sleep in the same way humans do, they have circadian rhythms—internal clocks that, like our own internal clocks, tell them when it's night and when it's day. And like many people, plants are less active ...

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