It was 25 years ago that Sinéad O'Connor's "Nothing Compares 2 U" started a four-week run at No. 1 on the Billboard Hot 100 singles chart. In honor of the April 21, 1990, anniversary, check out who else produced the top pop hits of 1990.
Studies have shown medical marijuana can help treat or alleviate ailments associated with certain diseases. Here are 10 of those diseases and a little bit about the medical studies thatdiscovered potential benefits of the drug.