Why does math get so hard that you have an answer but you forget what your answer was because it was so so so so so so so so so so so so so so hard. Why is it hard?

Why the moon is not visible from earth during the new moon ?

What was on result of the potato famine

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies? a. it's a region that exhibits a weak gravitational pull, thus maintaining a safe distance from the sun. b. it's an area that doesn't experience any major weather events that could cause mass extinctions. c. it's an area that's an optimal distance from the sun for potentially supporting life. d. it's a region that's unaffected by asteroid or meteor impacts.