Question

fix the two plural or possessive errors. most childrens interest in stars wanes as they get older. but one childs fascination led him to study physics at harvard and astrophysics at columbia university. that child, neil degrasse tyson, became director of the world - renowned hayden planetarium in 1996.

Explanation:

• "childrens'" is incorrect. The plural of "child" is "children", and the possessive form for plural nouns ending in -s is formed by adding an apostrophe ('). But "children" is an irregular plural, so the possessive is "children's".
• "childs" is incorrect. The possessive form of the singular noun "child" is "child's".

Answer:

Most children's interest in stars wanes as they get older. But one child's fascination led him to study physics at Harvard and astrophysics at Columbia University. That child, Neil deGrasse Tyson, became director of the world - renowned Hayden Planetarium in 1996.