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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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Beauty and aesthetics
Can you see music in this painting? How synaesthesia fuelled Kandinsky’s art
10 minutes
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Astronomy
The remarkable innovations inspired by our need to know the night sky
5 minutes
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Knowledge
Why it takes more than a lifetime to truly understand a single meadow
11 minutes
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Physics
Groundbreaking visualisations show how the world of the nucleus gives rise to our own
10 minutes
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Earth science and climate
There’s a ‘climate bomb’ ticking beneath the Arctic ice. How can we prepare?
8 minutes
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Political philosophy
The radical activist couple who fought for social change in the courtroom
21 minutes
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Physics
To change the way you see the Moon, view it from the Sun’s perspective
5 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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Human rights and justice
Can providing humanitarian aid be illegal? A troubling case from the US-Mexico border
17 minutes