ELI5: Explain Like I'm 5

Milnor's sphere

Okay kiddo, imagine you have a bunch of small balls that you could play with. They can bounce and roll around, and you can even connect them to make different shapes. Well, Milnor's Sphere is something like a really special shape that you can make with some of those balls.

Now, let's imagine you have a bunch of balls that are all tied together, kind of like how beads are sometimes strung on a necklace. You can imagine that if you pull on one of those beads really hard, it might snap the string and all the beads would fall apart. That's kind of like what happens with Milnor's Sphere.

See, Milnor's Sphere is made up of little spheres called "slices" that are all tied together in a really special way. If you pull on any one of those slices, the whole thing falls apart and you end up with just a bunch of loose slices. But the interesting thing is that even though the sphere falls apart, it's still really important because it helps mathematicians study other shapes and spaces.

So, in summary, Milnor's Sphere is like a special shape made up of little balls that are all tied together in a way that makes it really easy to study other shapes and spaces.
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