1) The first successful human heart transplant was performed by Dr. Christiaan Barnard in 1967.

2) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.

3) The Edelweiss flower, found in the European Alps, is known for its beauty and is often associated with mountaineering and alpine culture.

4) The windshield wipers were invented by a woman named Mary Anderson in 1903.