Libra: Daily green

Have fun writing secret messages to friends and coworkers by using homemade invisible eco-ink. Experiment using milk, lemon juice, or baking soda and water. Dab a toothpick in any of those liquids, and write your message on white paper. Let the liquid dry so the message disappears. To read the message, hold the paper to a heat source like a light bulb. The words should magically reappear as the heat darkens the letters.