Steve Jobs wanted the iPad to herald a revolution in textbooks.
In his biography of the late Apple co-founder, author Walter Isaacson said Jobs saw textbooks as another market ripe for disruption by releasing digital versions on the iPad.
Digital textbooks usually include dynamic elements, like pictures or video clips. Chaim Gingold has taken that to the next level with "Earth Primer", an app that teaches you about our planet by letting you play with an interactive model of it.
"Earth Primer" allows you to summon rainclouds to send streams of water cutting through mountains to demonstrate how erosion works instead of just telling you. You can also raise the sea level, create glaciers, even move continental plates around - all to explain the inner workings of the Earth.
Watch Gingold tell Kristie why he created the app in the clip above.