I donated my left kidney to save my mother, but at her “discharge party” she toasted: “To your sister — who organized the fundraiser and saved my life.” Thirty relatives laughed and mocked my “uselessness.” Shivering with a 40-degree fever from a lethal infection, she enjoyed her luxury Aspen ski trip with my sister. Instead of crying, I slept and was woken up by 25 missed calls.

I reached into my bag and pulled out a digital thermometer I had been carrying. I tucked it under my tongue, hidden by my hand. When it beeped, the tiny screen read: 40.1°C (104.2°F).