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A thick layer of smoke from the Carr Fire settles over California's Central Valley in a view from a jet earlier this summer. Fine particulate matter from drifting wildfire smoke mixes with industrial ozone and can become trapped between the mountain ranges. George Rose/Getty Images hide caption

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George Rose/Getty Images

Some research suggests that having multiples increases a parent's risk of mental health concerns — like depression and anxiety — before and after the children are born. Don't be afraid to admit it, parents advise. Emotional support can help. Terry Vine/Getty Images hide caption

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Terry Vine/Getty Images

These PET scans show the normal distribution of opioid receptors in the human brain. A new study suggests ketamine may activate these receptors, raising concern it could be addictive. Philippe Psaila/Science Source hide caption

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Philippe Psaila/Science Source

Scientists find that the whiskers of harbor seals help them distinguish predator from prey — even from a distance. Douglas Klug/Images hide caption

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Douglas Klug/Images

Need To Track A Submarine? A Harbor Seal Can Show You How

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A tinted transmission electron micrograph of Chlamydia trachomatis bacteria (light purple/black) inside a cell. Chlamydia is the most common sexually transmitted disease in the U.S., with more than 1.7 million reported cases in 2017. Biomedical Imaging Unit, Southampton General Hospital/Science Source hide caption

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Biomedical Imaging Unit, Southampton General Hospital/Science Source

Chimps use sticks to poke into a mock termite mound to taste a sweet substance placed in the mound by keepers at Chimp Haven in Keithville, La. Today, caretakers say, more chimps in the U.S. live in accredited animal sanctuaries than in research facilities. Janet McConnaughey/AP hide caption

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Janet McConnaughey/AP

Too Frail To Retire? Humans Ponder The Fate Of Research Chimps

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Without including a "control group" of sepsis patients who get the usual mix of drugs and fluids, even a big study comparing two other experimental approaches won't deliver helpful answers, critics say. Portra Images/Getty Images hide caption

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Portra Images/Getty Images

Critics Trying To Stop A Big Study Of Sepsis Say The Research Puts Patients At Risk

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An image of a rosehip neuron (top) and a connecting pyramidal cell (bottom). Tamas Lab/University of Szeged hide caption

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Tamas Lab/University of Szeged

What Makes A Human Brain Unique? A Newly Discovered Neuron May Be A Clue

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Previous research has shown that babies in the first year of life understand that certain individuals tend to win in social conflicts — such as individuals that are physically larger, or that come from larger social groups. Rick Lowe/Getty Images hide caption

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Rick Lowe/Getty Images

Toddlers Like Winners, But How They Win Matters

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A researcher showed people a picture of The Thinker in an effort to study the link between analytical thinking and religious disbelief. In hindsight, the researcher called his study design "silly". The study could not be reproduced. Peter Barritt/Getty Images hide caption

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Peter Barritt/Getty Images

In Psychology And Other Social Sciences, Many Studies Fail The Reproducibility Test

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Mario Ramos (left) and wife Tally adjust their umbrellas in Laguna Beach, Calif. The state was among a number of places this summer that experienced their highest temperatures on record. Jae C. Hong/AP hide caption

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Jae C. Hong/AP

Arcinella cornuta was included in a new study of fossil and extant bivalves and gastropods in the Atlantic Ocean. Researchers found that laziness might be a fruitful strategy for species survival. Neogene Atlas of Ancient Life / University of Kansas hide caption

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Neogene Atlas of Ancient Life / University of Kansas

Survival Of The Sluggish: Scientists Find An Upside To A Low Metabolism

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Alberta Aurora Chasers captured STEVE in April in British Columbia, Canada. STEVE is the narrow ribbon of white-purple hues overhead, and the vibrant green light on the right is an aurora located further north. Ryan Sault hide caption

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Ryan Sault

Researchers made an important discovery in the Denisova Cave in southern Siberia. Sergei Zelensky/IAET SB RAS hide caption

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Sergei Zelensky/IAET SB RAS

Ancient Bone Reveals Surprising Sex Lives Of Neanderthals

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