The newsletters I am most likely to open and read (ie actually click on to access the full text) are those from science sites that feature new research.
FDA Approves First Standardized Powder for Allergy Desensitization
Non-Stick Chemicals Found in Drinking Water Across US
Smoke-Damaged Cells Can Be Replaced – It’s Never Too Late To Quit
APOE4 Gene Carriers at Greater Risk for Memory Deficits from Soccer Headings
Antibodies Found in Rheumatoid Arthritis Linked with Chronic Obstructive Pulmonary Disorder (COPD)
Fish Oil May Improve Testicular Function