The appendix (worm-like appendix) is a tube about 8-15 cm long and about 1 cm in diameter, extending from the lower end of the cecum and closed on the other side. It is a “blind” tube that leads nowhere.
It’s because the four actions of arithmetic-addition, subtraction, multiplication, and division-are actually unequal. Mathematicians recognize only two of them - addition and multiplication - as valid.
The paper clip is a stationery item that everyone has held at least once. But people think little about who invented it, and something connected what interesting events with this minor detail for fastening documents