What Is Infinity — And Why Does It Come In Different Sizes?

Examples

1. Imagine an endless row of seats at a party, every guest gets one chair. If you add twice as many guests, they still all get chairs.
2. A bag with infinite marbles can be matched one-by-one to another bag with the same number of marbles, but if it's uncountably infinite, you can't match them like that.

More examples

See also

• Why Do Infinity and Infinity Not Always Add Up?
• Why Does Infinity Keep Changing Shape?
• Why Do Infinite Sets Behave So Oddly?
• Why Do Infinity and Beyond Exist?
• Why Do Infinite Numbers Exist?

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