Hard-Boiled Detection
Leah’s four sons were leaving home and moving to different cities.
Since they each enjoyed a hard-boiled egg for breakfast, the asked their mother for the recipe before they left.
On the first day following their move, Leah called them all to find out how things were going.
Reuven said “fine”.
Shimon said “great”.
Chaim said “fantastic”.
Yankel said “Could be better. My egg wasn’t fully cooked.”
Assuming all four followed Leah’s instructions verbatim, why was Yankel’s egg ruined?