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The kilogram has been transformed as new definition takes hold

Physics

The kilogram has been transformed as new definition takes hold

This picture shows the Kibble balance – the new way to measure the kilogram, as it joins other units in the SI measurement system which are pegged to physical constants

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air pollution particles

Environment

Deadly air pollution illuminated in beautiful long-exposure photograph

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squirrel

Life

How squirrels use their tails to square up to deadly cobras

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eagle

Life

Meet the white-tailed eagles making a comeback in the UK

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vines planted in volcanic hollows

Environment

Vineyards sit in moon-like craters on a volcano in Lanzarote

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Puma in snow

Life

Magnificent pumas photographed in snowstorms and whilst catching prey

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tree cells close up

Life

Wood under the microscope shows mistletoe invasions and tangled cells

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hoopoe

Life

Eurasian hoopoes protect their eggs with a dark foul-smelling goo

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A man on the remains of a bridge in Zimbabwe

Environment

Images show the devastation of Cyclone Idai

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Radar spikes

Space

Spiky space antenna will probe the frigid exteriors of Jupiter's moons

The Radar for Icy Moons Exploration instrument will start studying three of Jupiter's moons in 2029 as part of a European Space Agency mission

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Life

Flower hat jelly has colour-tipped tentacles for paralysing small fish

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Environment

Amazing Arctic images show how ice melt is creating the new north

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Life

Croc dad goes for a swim with 150 floating babies

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Space

NASA's photo archives reveal 60 years of space travel

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