JERRY COLEBY-WILLIAMS: Healthy plants should be able to get all of the nutrients they need from the soil. But if your soil is too acid or too alkaline they won't be able to get the goodies - no matter ...

Today’s Google doodle honors the Danish chemist S.P.L. Sørensen. As the head of Copenhagen’s Carlsberg Laboratory, Sørensen is known for inventing the pH scale to measure acidity and alkaline levels ...