Physics is mathematical not because we know so much about the physical world, but because we know so little; it is only its mathematical properties that we can discover. – Bertrand Russell
Sisters annoy, interfere, criticize. Indulge in monumental sulks, in huffs, in snide remarks. Borrow. Break. Monopolize the bathroom. Are always underfoot. But if catastrophe should strike, sisters are there. Defending you against all comers. – Pam Brown