science
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Major effort needed to make cannabis use less harmful, say scientistsAs more countries relax their laws and with drug potency rising, it is crucial to take steps to reduce harm from cannabis use, researchers say
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Rock of ages: impact of manmade crystals defining new geological epoch – studyResearchers say 208 of more than 5,200 officially recognised minerals are exclusively, or largely, linked to human activity merely in last 200 years and indicate new geological epoch
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How much pee is in our swimming pools? New urine test reveals the truthOlympic swimmers admit to it and it seems many of the rest us are peeing in the water too, with a new scientific test finding up to 75 litres of urine in public pools -
World's oldest fossils found in Canada, say scientistsIf correct, the microfossils, thought to have formed between 3.77bn and 4.28bn years ago, offer the oldest direct evidence of and insight into life on Earth
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Increased risk of 11 types of cancer linked to being overweight, researchers warnStudy shows strong evidence of a link between excess body fat and cancers of the colon, breast, pancreas and ovary among others
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Perimeter Lecture: The James Webb Space TelescopeThe Hubble Space Telescope transformed our view of the universe; in the March 2017 lecture of this popular lecture series, NASA astrophysicist Amber Straughn will give an update in its successor, due for launch in 2018
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Penicillin mould created by Alexander Fleming sells for over $14,000Auction house Bonham’s sells mould which was instrumental in the discovery of the world’s first antibiotic
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Hidden figures no more: female Nasa staff to be immortalised in LegoSet of five scientists, engineers and astronauts – including Katherine Johnson – wins Lego Ideas contest and will go into production
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key issues
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SpaceSpaceWorld’s oldest fossils discovered in Canadian rocks – videoA team of scientists working at University College London have discovered the world’s oldest fossils in rocks on the Canadian coastline
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BiologyBiologyHeart tissue cryogenics breakthrough gives hope for transplant patientsSuccessful freezing and rewarming of tissue sections by US team avoids damage by infusing the them with magnetic nanoparticles, paving way for entire organs
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GeneticsGeneticsCancer patients could be disadvantaged by Brexit, say expertsCollaboration with Europe is crucial to future breakthroughs, say cancer experts including Nobel prize winner Sir Paul Nurse
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Medical researchMedical researchMajor effort needed to make cannabis use less harmful, say scientistsAs more countries relax their laws and with drug potency rising, it is crucial to take steps to reduce harm from cannabis use, researchers say
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PsychologyPsychologyHow internet porn caused the rise of Donald TrumpDean Burnett: Is internet porn a big part of Donald Trump’s presidency?
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PhysicsPhysicsSir Peter Mansfield: the 11-plus failure who won a Nobel prizeLetters: Proponents of this socially divisive examination will object to the use of such anecdotes to attack it, but anecdotes about the odd unprivileged child going to a grammar school are all that they offer us to justify it
in depth
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At £140 a mile, how does Elon Musk’s moon trip compare with other journeys?From car to rail, it’s hard to find a terrestrial journey that matches SpaceX’s astronomical cost
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opinion
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Being christened Tim sets you up for a life of failure, it’s been claimed. I’d hoped this was nonsense, but sadly a new study suggests it may be trueNo honour, no pride: a brief history of Tim
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The Guardian view on alien life: dark star, bright prospectsEditorial: The discovery of planets where other lifeforms might flourish makes the universe look more interesting – even if we never reach them
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pictures & video
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Iron age jewellery found in Staffordshire field – video reportTwo metal-detecting friends have unearthed a hoard of iron age gold jewellery in a Staffordshire field
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Open wide: a fascinating look at teeth – in picturesThe Teeth of Non-Mammalian Vertebrates by Barry Berkovitz and Peter Shellis offers a unique look at teeth, from the hardened skin rasps of the lamprey to the fangs of the rattlesnake
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Nasa announces discovery of seven Earth-sized planets – video reportThe find has widely excited the astronomy community because of its implications in the hunt for alien life beyond the solar system
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SpaceX rocket blasts off from historic NASA launchpad – videoSpaceX successfully launches a Falcon 9 rocket in Florida on Sunday on a resupply mission to the International Space Station
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NASA's ISS crew throw American football in space to honour Super Bowl – videoAstronauts throw an American football around the International Space Station on Saturday to mark the upcoming Super Bowl LI on Sunday
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Spacewalks and moon landings: Nasa archive photos up for auctionA set of pictures from US space programme, including the first moon landing images, could fetch up to £20,000 at a New York auction next month
Heart tissue cryogenics breakthrough gives hope for transplant patients