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The womb isn’t as welcoming a space for a developing offspring as you might imagine. Indeed, from the moment an embryo is implanted in the mother’s womb, her immune system views the foreign body as something of an invader. Thereafter, the relationship between mother and developing baby is at least partially defined by a biological war over resources. In this clash, the placenta serves as a life-giving intermediary between mother and offspring, allowing for the transport of nutrients while keeping blood supplies entirely separate. With a surrealist-inspired touch, this animation by Diana Gradinaru for the Royal Institution of Great Britain traces the many functions of this fascinating, essential and short-lived organ, as well as its viral evolutionary origins.
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Earth science and climate
The only man permitted in Bhutan’s sacred mountains chronicles humanity’s impact
22 minutes
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Cosmology
The Indian astronomer whose innovative work on black holes was mocked at Cambridge
13 minutes
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Astronomy
Seven years later, what can we make of our first confirmed interstellar visitor?
59 minutes
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Physics
Is it possible to design a shape to roll along any fixed path?
4 minutes
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Biotechnology
The two women behind a world-changing scientific discovery
14 minutes
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Medicine
Why surgery and barbering were one occupation in the Middle Ages
6 minutes
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Space exploration
Mind-bending speed is the only way to reach the stars – here are three ways to do it
5 minutes
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Biography and memoir
As her world unravels, Pilar wonders at the ‘sacred geometry’ that gives it structure
20 minutes
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Meaning and the good life
Why strive? Stephen Fry reads Nick Cave’s letter on the threat of computed creativity
5 minutes