Archaeologists studied hundreds of unfinished stone heads in a quarry on Easter Island to better understand how they were constructed and the society that made them.

Easter Island quarry reveals how Polynesians made enigmatic stone statues

A telescope in Chile has captured a stunning new picture of a grand and graceful cosmic butterfly.  At the heart of this bipolar nebula is a white dwarf star that cast aside its outer layers of gas long ago.  Schoolchildren in Chile chose this astronomical target to celebrate 25 years of operation by the International Gemini Observatory.

Telescope in Chile captures stunning new picture of a cosmic butterfly

The mysteries of Easter Island, subjects of speculation for centuries, yield to scientific inquiry.

Drones, physics and rats: Studies show how the people of Rapa Nui made and moved the giant statues – and what caused the island’s deforestation

We have more neurons in our cortices than any other species, courtesy of an early technology – and along with them came our long, slow lives, with plenty of chances to gather around the dinner table.

Your big brain makes you human – count your neurons when you count your blessings

Tryptophan, found in food, is an important ingredient in the neurotransmitter serotonin. But is that enough to support it as a possible mood booster? The research is decidedly mixed.

Turning to turkey’s tryptophan to boost mood? Not so fast

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