1) A single bolt of lightning can heat the surrounding air to temperatures five times hotter than the surface of the sun.

2) The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of knowledge and played a key role in the Renaissance.

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

4) The world's oldest tree is believed to be a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.