He said that the app's cultural relevance is an "accelerant" to its product. Duolingo is famous for its creative and guilt-inducing app notifications and social media posts. Hundreds of versions of ...

Pottery Barn Kids' baby elephant costume ($47, originally $59) is made of velvety-soft fleece with floppy ears and a raised trunk. Chasing Fireflies' fancy flamingo costume ($79) has a sparkly tulle ...

Duolingo's CEO highlighted the Duo-themed Halloween costumes that went viral this year. He said that the app's cultural relevance is an "accelerant" to its product. Duolingo is famous for its creative ...