[facebook.com]

Krauss gets it wrong, which is not surprising considering he is a scientist and NOT an educator.

Teach a child the earth is 6k years old.
Teach a child the earth is 6M years old.

Overcoming ignorance is NOT being told which is the right answer.
Overcoming ignorance is the child being able to figure out, on their own, which is the right answer.

Thus I find value in teaching both in school for otherwise, we teach kids the wrong lesson that they should believe everything they are taught, which is the absolute wrong lesson.