When you're cold or deeply moved, tiny muscles make each of your hairs stand up. In furry mammals, this reflex fluffs up the coat for insulation or to look bigger in the face of danger. In you, with such fine hair, it does almost nothing, except give away a shiver during a great song.
Every day, your kidneys filter around 180 liters of blood plasma, about a bathtub's worth. Yet you only have about 3 liters of plasma, so it passes through your kidneys some sixty times a day. Over 99% of the filtered water is reabsorbed, leaving just one to two liters of urine.
A 70 kg adult is made of about 7 × 10²⁷ atoms, or seven billion billion billion. The observable universe is thought to hold on the order of 10²² to 10²⁴ stars. Even with the high estimate, you contain thousands of times more atoms than there are stars in the entire visible cosmos.