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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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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
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Cosmology
The Indian astronomer whose innovative work on black holes was mocked at Cambridge
13 minutes
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Ethics
For Iris Murdoch, selfishness is a fault that can be solved by reframing the world
6 minutes
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Death
A hunter’s lyrical reflection on the humbling business of being mortal
6 minutes
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Love and friendship
After his son’s terrorist attack, Azdyne seeks healing – and his granddaughter
25 minutes
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Astronomy
Seven years later, what can we make of our first confirmed interstellar visitor?
59 minutes