1) The word "piano" contains three vowels: I, A, and O.

2) The Great Wall of China is a UNESCO World Heritage site and one of the most iconic man-made structures in the world. It stretches over 21,196 kilometers (13,171 miles) and was constructed to protect the Chinese empire from invasions during ancient times.

3) The most intense cyclone ever recorded was Cyclone Tip in 1979, with a minimum central pressure of 870 millibars and maximum sustained winds of 190 miles per hour (305 kilometers per hour).

4) The first successful consumer digital camera, the Apple QuickTake 100, was released in 1994 and had a resolution of 640 x 480 pixels.