"צביעה באוכלים" (coloring in foods) - the stringent view of some poskim
What are the circumstances needed to consider one's actions "מדידה של מצוה" (measuring for a mitzvah).
Understanding the concept of "מדידה של מצוה" (measuring for a mitzvah).
Dealing with a Raccoon, Squirrel, or Rat on Shabbos;