Grant and Lincoln Markham took an elementary school science project and turned it into What's Inside, a family YouTube channel that has close to one million subscribers and 131 million views. The school project involved cutting into two sports balls to see what is inside, which they made into a video. After they exhausted sports equipment, they moved onto other objects. They have cut open an olympic torch (Rio 2016), fire extinguishers, an Etch-a-Sketch, and lava lamps. They've even explored what's inside LEGO headquarters and have a TESLA series. Some of their videos include family travel vlogs.
The Markhams are members of The Church of Jesus Christ of Latter-day Saints.