Meet Nina, the girl who knows it all! She's here to answer all your burning questions - from knowing why hotdogs are called hotdogs to knowing who the coolest grandma around is.

Nina continues to prove she knows everything by answering some of the most important questions in the world, such as whether or not fish fart and where teachers actually go after school.

Know It All Nina is back answering the important life questions like - do you know who invented the selfie? How about why people yawn? Well Nina know it all does! Or at least she thinks she does.