Crochet your own heroes of the circulatory system: the Red Blood Cell, White Blood Cell, and Platelet. Makes fast, easy, cute gifts for a special nurse in your life or a pre-med student, or to give happy thoughts and support to an ill friend. RBC is about 4 inches (10 cm) wide. You will need an E/3.5mm hook, worsted-weight yarn, two 9mm or 10mm black eyes, calf-length tube sock for stuffing, and black embroidery floss. WBC is about 4 inches (10 cm) in diameter. You will need an F/3.75mm…