African-Americans were discriminated against even while they were serving their country during WWI and WWII. President Harry Truman ended that discrimination when he signed Executive Order 9981 on 26 July 1948.
On the 27th of July, 1921 - while working in their lab at the University of Toronto - Dr. Frederick Banting and his medical assistant, Charles Best, isolated insulin. Their discovery changed the world for people with diabetes.
In an unusual night battle, Britain's Admiral Horatio Nelson gets reinforcements to continue his attack against French ships at Abu Qir Bay (Egypt). Around 10 PM on 1 August 1798, the French flagship is destroyed in a massive explosion.