Mario Runco is an astronaut and planetary scientist for NASA.
Runco filmed a segment for Sesame Street in which he visited his old elementary school and spoke to the children about what it's like being an astronaut.
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Mario Runco is an astronaut and planetary scientist for NASA.
Runco filmed a segment for Sesame Street in which he visited his old elementary school and spoke to the children about what it's like being an astronaut.