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What is a pure tone?

Most of us can recognize when music is out of tune. Why can we hear this, and what exactly is a pure tone?

Arctic soils: a ticking climate time bomb

Carbon emissions from Arctic soils threaten to greatly accelerate climate change by 2050.

“Irreversible” glacier retreat in West Antarctica began 70 years ago

The retreat of the Pine Island Glacier on the West Antarctic ice shelf began in the 1940s, kick-started by the arrival of warm water from the Pacific Ocean.

Animal teeth record how species live and die

New technique uses animals’ teeth to see how their environment changed throughout their lives.

Inuit hunted whales 4,000 years ago

Fossil DNA from kitchen midden deposits reveal masses of whale blubber, leading scientists to believe that Greenlanders hunted the ocean’s giants 4,000 years before anyone else.

Snake venoms’ deadly secret unlocked: study

Scientists move one step closer to developing a near-universal antidote that could treat a broad range of snake bites.

Should genetically modified organisms be part of our conservation efforts?

OPINION: Should the Seed vault on Svalbard collect and preserve GMO-seeds?

Copenhagen Zoo antelope killed by fox

DNA analysis reveals the mystery killer of Copenhagen Zoo’s only duiker antelope.

New evidence that early chimps and bonobos interbred

Chimpanzees and bonobos have not always been able to keep their hands off each other. A new discovery could change our perception of how new species form.

Are aliens really trying to contact us?

Probably not. But why did two Canadian researchers think they were?

Time is running out to adapt to dramatic sea level rise

Eighty per cent of world’s coastal areas could experience more than 1.8 metres of sea level rise by 2100 if global warming exceeds two degrees Celsius by the middle of this century.

Arctic sea ice is approaching the limit of natural variability

Around 8,000 years ago, Arctic sea ice was lower than it is today--but rapid decline in the last 40 years means it is fast approaching this natural limit.

Today's selected stories