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For a long time, ecologists assumed tree rings to be absent in tropical trees because of a lack of temperature and rain fluctuations in the trees' environment. But in recent decades, the formation of growth rings has been proven for hundreds of tropical tree species, which are sensitive to drought and usually experience at least a month or two of slightly reduced rainfall every year.

From snowflakes to sunflowers, starfish to sharks, symmetry is everywhere in nature. 

If wind and solar power continue the rapid growth they achieved over the last decade, rising by 20 percent annually until 2030, the global electricity sector will do its part to limit warming to 1.5 degrees C, according to a new report from climate think tank Ember.

The day after lead author Daniel Winstead approved the final proofs for a study to be published in Ambio, the journal of the Royal Swedish Academy of Sciences, Russia put its nuclear forces on high alert.

From birdsong in the rainforest to whale calls in the oceans, the world is losing the variety of sounds that enriches life.