At My Parents’ Anniversary Party, One Insult—and One Letter—Changed Everything

out of a sleek lab. But it removed 98% of contaminants in our test water.

Ninety-eight percent.

We triple-checked the numbers, then quadruple-checked them. When we were sure, she wrote up her process in painstaking detail—dictating most of it to me while I typed, because asking her to write that many pages by hand would have been an act of cruelty. She continue reading …