How often you should wash your bed sheets, according to a microbiologist — and what happens when you don’t

Shutterstock We spend more than a third of our lives in bed — but that place can quickly blossom into a “botanical park” of bacteria and fungus, according to New York University microbiologist Philip Tierno. If left for too long, the microscopic life within the folds of our bed sheets can even make us sick, […]

How often you should replace your mattress, according to a microbiologist — and what happens when you don’t

Shutterstock New York University microbiologist Philip Tierno hasn’t slept a night in 25 years without something on his mattress that few people even think of buying. It’s a super-thin, largely invisible cover that slips over the mattress. And it protects him from what he calls a “zoologic park” of bacteria and debris that accumulates over […]