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With sperm counts falling around the world, researchers are finally getting to grips with the underlying causes - and coming up with ways to reverse the trend

Sperm counts are down worldwide, but researchers are finally getting to grips with why - and coming up with ways to reverse the trend

From The Matrix to Sliding Doors via Everything Everywhere All at Once, physicist Paul Halpern reveals his favourite films about the multiverse

Soil samples from a long-running UK experiment show that microplastic pollution has risen sharply in the past 50 years and is much higher in fields treated with organic or inorganic fertilisers

Expedition leaders say they have found several new species of octopus using a remotely operated vehicle around 3 kilometres deep near Costa Rica

Greater covid-19 vaccine uptake could have prevented several thousand deaths and hospitalisations in UK during a coronavirus wave in 2022

The latest coronavirus variant, JN.1, is more infectious, but seems to be causing less severe illness than in previous waves

Efforts are underway to tidy up the ocean's biggest plastic hotspot. But this cleanup operation could be damaging a unique ecosystem and doing little to stop the overwhelming plastic problem

Several enormous craters left by explosions have been spotted in Siberia over the past 15 years, and a new explanation links them to hot gas – and climate change

Invasive mink, which are native to North America, have been eradicated from most of East Anglia in England after a trial used the scent of the animals' anal glands to lure them into traps

Titan’s methane seas have ephemeral “magic islands” that have baffled scientists for years. They may be made of odd, porous clumps of snow

Titan’s methane seas have ephemeral “magic islands” that have baffled scientists for years. They may be made of odd, porous clumps of snow

Brain scans of 110 first-time mothers during and after pregnancy showed that some brain regions become thinner during pregnancy and that giving birth largely reverses this effect