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New Scientist’s guide to the 21 best ideas of the 21st century

Humans

��è��Ƶ’s guide to the 21 best ideas of the 21st century

A quarter of a century in, this is our definitive pick of the ideas in science and technology that are already transforming the world

Features

Man walking out of subway station

Health

These small lifestyle tweaks can add a year to your life

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Health

IVF success may depend on how long men abstain from ejaculation

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You can upgrade your immune system, but not in the way you think

Health

You can upgrade your immune system, but not in the way you think

Features

Killer whales and Pacific white-sided dolphins

Life

Killer whales and dolphins are ‘being friends’ to hunt salmon together

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HIV infected 293T cell.

Health

Man unexpectedly cured of HIV after stem cell transplant

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Health

Upheavals to the oral microbiome in pregnancy may be behind tooth loss

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Adult mice using their paws and mouths to remove pups stuck in a pregnant animal's birth canal

Life

Mouse 'midwives' help their pregnant companions give birth

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Life

Orcas are ganging up on great white sharks to eat their livers

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Health

Common IVF test misses some genetic abnormalities in embryos

Human embryos formed with in vitro fertilisation can develop genetic abnormalities in the time between genetic testing and implantation – though this may not affect their viability

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Humans

'Pregnancy test' for skeletons could help reveal ancient mothers

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Environment

Top 250 oil and gas firms own just 1.5% of the world's renewable power

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Health

What we know, and don't, about the link between painkillers and autism

Analysis

Health

Three simple rules for a great post-workout meal

Regulars