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The 20th-century Austrian-British philosopher Karl Popper believed that any theory that was not ‘falsifiable’ – capable of being tested and proven incorrect – should be dismissed as unscientific. He was particularly critical of Marxist theory, which he believed was constantly being revised by its adherents to account for its failed predictions, and therefore could not possibly be scientific. The falsification principle is a cornerstone of the modern scientific method, but some contemporary scientists, cosmologists and philosophers believe it might need to be revised as they investigate concepts such as string theory and the multiverse, which come up against the limits of what is testable – at least for now.
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Cosmology
Tiny, entangled universes that form or fizzle out – a theory of the quantum multiverse
11 minutes
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Rituals and celebrations
A beginner’s guide to a joyful Persian tradition of spring renewal and rebirth
3 minutes
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Astronomy
The history of astronomy is a history of conjuring intelligent life where it isn’t
34 minutes
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Metaphysics
Simple entities in universal harmony – Leibniz’s evocative perspective on reality
4 minutes
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Biography and memoir
Passed over as the first Black astronaut, Ed Dwight carved out an impressive second act
13 minutes
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Engineering
A close-up look at electronic paper reveals its exquisite patterns – and limitations
9 minutes
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Biography and memoir
The unique life philosophy of Abdi, born in Somalia, living in the Netherlands
29 minutes
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Cognition and intelligence
What’s this buzz about bees having culture? Inside a groundbreaking experiment
8 minutes
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Earth science and climate
The only man permitted in Bhutan’s sacred mountains chronicles humanity’s impact
22 minutes