Hello, dear readers, and welcome to this midsummer letters column. We hope you're in the habit of protecting yourselves from heat, bugs and sunburn. You've kept our inboxes busy, so onward to your mail.
– Regarding a column about nasal irrigation, a reader had a question: "Early on in the COVID-19 pandemic, medical advice was not to use a neti pot to wash out the nose due to possibly spreading viru…