Talk about a bizarre feature of the human body: If you happened to swallow a razor blade, your stomach acid would dissolve it. Acids are ranked on a scale from zero to 14—the lower the pH level, the ...

Did You Know: The notion of ‘zero-calorie’ or even negative-calorie foods has long captured the imagination of dieters and wellness enthusiasts. From crunchy celery and crisp cucumbers to peppery ...