Why is it necessary to place the potato halves on moist paper towels?

Placing potato halves on moist paper towels helps to maintain their moisture content, preventing them from drying out and becoming rubbery or shriveled. The moisture also promotes a suitable environment for any chemical reactions or processes, such as sprouting or enzyme activity, that may occur. Additionally, it can help in preventing browning by reducing exposure to air. Overall, this technique ensures the potatoes stay fresh and retain their desired texture.