It doesn’t take a flamethrower to stir up Lyme disease, as another long-fought war shockingly and suddenly ends without a winner. This puzzle only fits together one way, and the power of scale reveals the roots of another fiercely contested enigma. The odds that a bacterial infection is not involved grow astronomically, outrageously, long. Sit Down Before Reading, a memoir of misdiagnosis that unravels medicine’s greatest mysteries, continues with Chapter 47: Little Sparks.