Is human excrement that is unknown (could be human or animal) treated differently in a house versus a garbage dump?

Must the water for netilat yadayim come through direct human force (ko'ach gavra)?

Drying Hands After Washing

Is washing both hands simultaneously treated differently from washing one hand at a time with respect to cross-contamination?

Washing Vessels and Water Sources

Does HaTov VeHaMeitiv require that new wine and old wine be treated differently (i.e., does a change from new to old or old to new matter)?

Items Exempt from Blessing During Meal

Is a blessing recited on a river (or sea) whose course has been humanly altered or redirected?

Blessings on Natural Phenomena

May a woman go out on Shabbat wearing hair strands (wig/peah nochrit) made from human, other women's, or animal hair?

Anointing on Shabbat

Is a partition that arose on its own (without human action) or was made on Shabbat valid for eruv purposes?

Cross-Beam Construction Requirements