Small, battery-powered planes are on the way. But building large, zero-emission airliners is a daunting challenge.
Gardening Know How on MSN
Is Your Plant Dying or Just Taking a Nap? 5 Signs Plants Are Dormant – and When to Act
Bare stems, yellow leaves, no new growth? Don’t panic! Dormancy is nature’s way of recharging. But what is dormancy in plants ...
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