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Marijuana joint in a hand

Health

Quick saliva test can reveal cannabis use over the past 12 hours

A sample of saliva placed on a strip and analysed with a smartphone camera can reveal if a person has ingested cannabis in the past 12 hours

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Whales

Life

Climate change could slow recovery of southern right whales

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MRI scan of human head

Health

Women are less likely to get pregnant for two years after a concussion

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Woman taking sample for DNA test indoors, closeup; Shutterstock ID 1875765013; purchase_order: -; job: -; client: -; other: -

Health

DNA markers reveal if you shared a womb with twin that didn't survive

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Woman and child wearing colorful pair of woolly socks warming cold feet in front of heating radiator in winter time. Electric or gas heater at home. Part of body, selective focus.

Environment

Blame fossil fuels, not renewables, for the UK's winter energy crisis

Analysis

Human papillomavirus

Health

Having HPV while pregnant linked to increased risk of premature birth

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A mother performs lunges with a child on her chest in a baby carrier

Health

It really is difficult to get fit after giving birth, study reveals

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A Black Howler monkey

Life

Howler monkeys navigate using adaptable mental maps, just like humans

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mud ring made by dolphin

Life

Dolphins spotted trapping fish in mud rings in the Caribbean

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false killer whale

Technology

Secret underwater messages can be hidden in whale and dolphin chatter

Covert messages sent underwater can be camouflaged in the sounds of whales and dolphins, making them harder for others to detect

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Life

First known wild chimpanzee with albinism was killed by other chimps

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Video

Puzzle-solving great apes: The shared abilities underpinning language

Video

Humans

Fathom review: What happens when humans try to talk to whales

Culture

Health

Insight into early embryos could explain why some pregnancies fail

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