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The real reasons birth rates are declining worldwide

Society

The real reasons birth rates are declining worldwide

From the cost of childcare to the housing crisis, there’s no shortage of explanations for the dramatic global fall in the number of babies being born. These analyses, though, are all missing something, says cognitive and evolutionary anthropologist Paula Sheppard

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Fractal conceptual illustration of supersymmetry or superstrings. Supersymmetry (SUSY) is a particle physics theory that proposes a type of spacetime symmetry relating two basic classes of elementary particles: bosons, which have an integer-valued 'spin', and fermions, which have a half-integer spin. If supersymmetry is a true symmetry of nature, it would explain many mysterious features of particle physics and would help solve paradoxes such as the cosmological constant problem. There is only indirect evidence for the existence of supersymmetry, primarily in the form of evidence for gauge coupling unification. Direct confirmation would entail production of superpartners at collider experiments, such as at the Large Hadron Collider.

Space

A crisis in cosmology may mean hidden dimensions really exist

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The bombshell results that demand a new theory of the universe

Space

The bombshell results that demand a new theory of the universe

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Image from a MAYA collaboration numerical relativity simulation of a neutron star-black hole (NSBH) binary merger, showing the disruption of the neutron star. Credit: Deborah Ferguson (UT Austin), Bhavesh Khamesra (Georgia Tech), and Karan Jani (Vanderbilt University).

Space

A bizarre type of black hole could solve three cosmic mysteries in one

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Crisis in cosmology: If we’ve got dark energy wrong, what could it be?

Space

Crisis in cosmology: If we’ve got dark energy wrong, what could it be?

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A member of the media looks at Barnett Newman

Chemistry

The world’s most elusive colour is worth billions – if we can find it

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Head of research and development, call sign

Technology

How Ukraine became a drone factory and invented the future of war

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It’s your perception of sleep that’s making you feel tired all day

Mind

It’s your perception of sleep that’s making you feel tired all day

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Postpartum depression in dads is common – we can now spot and treat it

Health

Postpartum depression in dads is common – we can now spot and treat it

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Tim Booth Photography hand image - one-time use only

Humans

The untold story of our remarkable hands and how they made us human

The evolution of human hands is one of the most important – and overlooked – stories of our origin. Now, new fossil evidence is revealing their pivotal role

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Space

We’ve glimpsed before the big bang and it’s not what we expected

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Environment

Putting a price tag on nature failed. Can radical tactics save it?

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Mind

How teaching molecules to think is revealing what a 'mind' really is

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Health

Your BMI can't tell you much about your health – here's what can

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