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When assisting conception with in vitro fertilisation, embryologists need to achieve a delicate balance: transfer too many healthy embryos, and a woman faces the potential danger of twins or triplets; transfer too few, and a woman risks having to repeat the process or not having a child at all. Human fertilisation, as it turns out, is an uncertain process both inside and outside of fertility clinics. This video from KQED San Francisco’s science documentary series Deep Look shows how researchers are getting closer to making in vitro fertilisation a more precise science.
Producer: Gabriela Quirós
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Animals and humans
One man’s quest to save an orphaned squirrel, as narrated by David Attenborough
14 minutes
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Biology
Butterflies become unrecognisable landscapes when viewed under electron microscopes
4 minutes
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Biology
‘Save the parasites’ may not be a popular rallying cry – but it could be a vital one
11 minutes
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Evolution
The many ways a lizard tongue sticks, grasps, pinches and plops – in slo-mo
6 minutes
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Biology
Starlings swoosh like brushstrokes across the sky in this dazzling short
3 minutes
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Ecology and environmental sciences
The tree frog die-off that sparked a global mystery – and revealed a dark truth
15 minutes
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Ecology and environmental sciences
GPS tracking reveals stunning insights into the patterns of migratory birds
6 minutes
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Neuroscience
This intricate map of a fruit fly brain could signal a revolution in neuroscience
2 minutes
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Biology
Brilliant dots of colour form exquisite patterns in this close-up of butterfly wings
3 minutes