April 15

Events - Science & Technology

1923day.year

Insulin becomes generally available for use by people with diabetes.

In 1923, insulin became widely available to treat diabetes, transforming it into a manageable medical condition.
Beginning on April 15, 1923, pharmaceutical companies started distributing insulin for general medical use in Europe and North America. Discovered by Frederick Banting and Charles Best in 1921 and purified by James Collip, insulin was the first effective treatment for diabetes. Before insulin, a diabetes diagnosis was virtually a death sentence, but its availability dramatically improved patient survival rates. The introduction of mass-produced insulin paved the way for modern endocrinology and ongoing innovations in diabetes care. Insulin therapy continues to save millions of lives and remains a cornerstone of diabetic treatment worldwide.
1923 Insulin diabetes
1952day.year

First flight of the Boeing B-52 Stratofortress.

The Boeing B-52 Stratofortress takes to the skies on its maiden flight, marking the beginning of a legendary bomber's service.
On April 15, 1952, Boeing's new B-52 Stratofortress completed its first flight from Seattle, Washington. Designed as a long-range strategic bomber, the B-52 promised unprecedented payload and range. Its maiden flight demonstrated the airframe's robust performance and handling characteristics. The aircraft would go on to serve for decades, including roles in nuclear deterrence and conventional warfare. The B-52 remains one of the longest-serving military aircraft in history.
1952 Boeing B-52