Why is 'false' truthy in javascript?

Question

I understand that an empty string is falsy in javascript and a not-empty string is truthy in javascript.

However, why is \'false\' truthy in javascript,

Answer 1

It's by definition. It's a string and it is handled as such. No matter the meaning of the string.

If your logic would be applied. Then how about following examples:

"1+3==2"
"humans have four eyes"

Are they also falsy?