WREX was built to assist disabled children such as two-year-old Emma Lavelle who suffers from a rare congenital disorder that limits her arm movement. Two scientists from the Nemours/Alfred I. duPont Hospital for Children printed the lightweight exoskeleton from the same plastic Lego bricks are built from, allowing the toddler to partake in the finer joys in life such as eating and playing with toys. Life changer.