Duolingo, best known for its whimsical owl and language-learning app, is working on a new product to add to its growing suite: a math app, according to CEO Luis von Ahn. The co-founder mentioned the ...

LOWER MERION, Pennsylvania (WPVI) -- Math can be a challenging subject for kids in any grade. To help students stay on track and really learn to love the subject, there's something really special ...