When it comes to gigantic predatory dinosaurs one animal reigns supreme: Tyrannosaurus rex, the tyrant lizard king, or T. rex for short. But what if T. rex never existed the way you might picture it? For almost 100 years, we've imagined T. rex as a lone king, an apex predator overseeing their world unchallenged. But that's wrong. A new T. rex fossil has since changed everything we know about this iconic carnivore and revealed something astonishing: the T. rex isn't just one species, but many. Meet Nanotyrannus.
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00:00:02 Introduction
00:02:03 Was T. rex Ever Really King?
00:06:03 The Mystery of the Baby T. rex
00:12:28 The Fossil That Changed Everything
00:22:35 Lumpers Versus Splitters: The Debate Gets Bigger
00:28:20 The Slow King
00:33:49 Rethinking the End of the Dinosaurs
The first signs of dark matter particles may finally have been spotted
Researchers may have spotted the first signs of a dark matter particle. If the result is confirmed, it could be one of the most monumental discoveries in the history of physics.
Dark matter makes up about 85 per cent of matter in the universe, but for decades physicists have been unable to determine what it itself is made of. Hypotheses have ranged from different sorts of particles and forces to strangely behaving gravity and everything in between – but the leading idea has always been that of the weakly interacting massive particle, or WIMP. As we have built more and more powerful detectors to search for WIMPs, though, their failure to show up has led many to doubt their existence and move on to more exotic ideas.
According to Jim Al-Khalili, the short answer is: yes, at least in principle.
Travelling into the future is already allowed by Einstein’s relativity. Move close enough to the speed of light, or spend time near an extreme gravitational field like a supermassive black hole, and time would pass more slowly for you than for everyone else.
Travelling into the past is where things get much stranger.
Watch the full video at https://youtu.be/IDNCWe3ufCE
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