Eli5 why it is difficult for humans to read a lot of 0s, like 2000000, but not words?

Question

Eli5 why it is difficult for humans to read a lot of 0s, like 2000000, but not words?

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Answer 1

It isn’t difficult to read a lot of zeros, it’s difficult to count the number of zeros. You’ll have the same problem with any letter or number when it is repeated more than four or five times in a row.