Facts

Facts the Peabody Encyclopedia for kids

Real facts about everything, written for your grade.

Squirrels, Jell-O and Mars

Mark Rober: Who is Mark Rober?

Mark Rober is an engineer. He makes science videos for YouTube.

Mark worked at NASA. He worked at its Jet Propulsion Laboratory for nine years.

He worked on Curiosity. Curiosity is a rover that went to Mars. He worked on the jet pack. It lowered the rover to the surface of Mars.

Mark has battled squirrels in his videos. The squirrels steal seeds. He built an obstacle course. It was to keep squirrels away from a bird feeder.

He filled a pool with Jell-O. Mark's builds are big and silly.

He puts up a new video about once a month. That was true as of April 2026.

Mark and MrBeast started Team Trees. Its goal was to plant 20 million trees.

Mark started CrunchLabs. It makes kits for kids. Kids use them to build things. They learn about engineering.

Mark wants kids to love science. He wants them to love engineering too.

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