Between 2016-2017 and 2018-2019, 20.1% of adult smokers who used electronic nicotine delivery systems discontinued cigarette smoking at follow-up compared with 16.5% of those who did not use e ...

Tracking down the culprit behind an outbreak of typhoid fever in 1900s New York was a breakthrough in how symptom-free carriers can spread sickness. An Irish cook named Mary Mallon was the first ...