Understanding the concept of "מדידה של מצוה" (measuring for a mitzvah).
(Squeezing materials.) using a "MOP"on Shabbos;
ודבר דבר (Dabair Davar): Understanding the Reasons Behind Talking About a Mitzvah on Shabbos;
grapes and olives that were crushed before shabbos; whole grapes in wine or grape juicel;