Mark Rober makes science videos for YouTube. He says he hides the science like vegetables. Kids click on a fun video. The science comes along with it. He puts up a new video about once a month, as of April 2026.

Mark's first video on YouTube showed a Halloween costume. In 2011, Mark's iPad Halloween costume helped to launch his YouTube channel. He used two iPads. They made it look like he had a hole through the middle of his body.

Mark's builds are big and silly. In his videos, he has battled squirrels that steal seeds. He built an obstacle course, and its job was to keep squirrels away from a bird feeder. He also filled a pool with Jell-O.

Mark is an engineer. He worked at NASA for nine years. He worked on the Curiosity team. Curiosity is a rover that went to Mars. He also worked on its jet pack. The pack brought it down to the surface of Mars.

Mark teamed up with a YouTuber named MrBeast to help the environment. They started Team Trees. Its goal was to plant 20 million trees. They also started Team Seas. Its aim was to clean up trash from oceans, rivers and beaches.

Mark started CrunchLabs. It is a company that makes kits for kids. Kids use them to build things. They learn about engineering. CrunchLabs wants kids to learn to think like an engineer. Mark wants kids to love science and engineering.

Words to know

• rover: Mars explorer
• Curiosity: a Mars rover
• kits: things to build