2026-03-11
18 分钟Welcome to True Spies.
The podcast that takes you deep inside the greatest secret missions of all time.
You'll meet the people who live life undercover.
What do they know?
What are their skills?
And what would you do in their position?
Seeing these people pay for what they've done felt righteous.
True Spies from Spyscape Studios, wherever you get your podcasts.
Alzheimer's disease is the most common form of dementia which is the leading cause of death in the UK,
the joint top cause in Australia and the fifth most common cause of death in the United States.
It's a terrible disease and we've thought for over a hundred years that Alzheimer's is something that starts in the brain,
something goes wrong in the brain and then it leads to dementia.
But now this compelling evidence that Alzheimer's in fact begins in places like the skin,
the lungs or the gut.
It begins outside the brain and it spreads to the brain and there it forms these characteristic misshapen proteins.
But the idea that it starts outside the brain is radical stuff.
It could really upend our understanding of the disease.
That's what we're getting into on this episode of The World, the Universe and Us from New Scientist.
I'm Dr Rowan Hooper.
I'm joined by reporter Alice Klein.