What is a black hole? Cosmologist Pau Figueras explains.

Kip Thorne explains how to explore the Universe with gravitational waves.

David Tong explains one of the most important equations in science.

Can we define an event without reference to space and time? And why would this be useful? Laura Mersini-Houghton explains.

The renowned physicist Juan Maldacena, of the Institute of Advanced Study in Princeton, has developed a great analogy to explain the beautiful symmetries that underpin the fundamental forces and particles, including the Higgs boson: he thinks of space as a grid of countries and of particles as travellers keen on making money by speculating with currencies.

In this interview cosmologist Marina Cortês explains how time emerges in a block universe, exploring the arguments for and against this theory, and alternative explanations where time is fundamental.

Most of us know what we mean when we say that something has happened. For theoretical physicists, however, this isn't an easy question. Sean Carroll of the California Institute of Technology explains why it's hard to define events and what to do about it.

Most of us know what we mean when we say that something has happened. Theoretical physicists, however, struggle with the concept of an event. Why?

Imagine if your body weight depended on the colour of your underwear. Strangely, something quite similar happens when you make measurements in quantum mechanics. Discover more about contextuality in this video interview with Jeremy Butterfield, philosopher of physics.

Quantum mechanics suggests that observers can influence the outcomes of measurements. If that's the case, then do these observers need to be conscious? Does consciousness play a special role in physics at all?

Modern theories suggest that the Universe really is unimaginably large — perhaps it's infinite, but even if it's not, it's so large it may as well be. But does this sheer scale affect how we reason about cosmology? In this video interview, we talk to David Wallace to find out more.

Quantum mechanics seems to suggest that passive observation is impossible: the very act of looking at something can change what's being looked at. In this video interview, we talk to David Wallace and Adrian Kent to find out more.

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