Technology Fun Facts
Normally, a person blinks about 20 times a minute, but a computer user blinks only 7 times a minute! To prevent eye strain, follow the 20-20-20 rule:
- Every 20 minutes, look at something 20 feet away from your computer or TV screen for 20 seconds. Why 20 seconds? It takes your eyes that long to relax!
- ENIAC was one of the earliest computers made, and was made public in1946 in Pennsylvania. It was called a "Giant Brain" by the press. It contained 17,500 vacuum tubes, linked by 500,000 connections. It filled a 50-foot long basement room and weighed 30 tons (60,000 pounds). Today, a single microchip, no bigger than a fingernail, can do more than those 30 tons of hardware. Its total cost was about $500,000 which is approximately $6,300,000 today.
- Computer circuitry can be destroyed by static electricity. It is so mild for humans that we don't even feel it.
Computer memory is measured in bytes. A byte is the unit computers use to represent a character such as a letter, number or symbol (like @ or #). It's the smallest unit of memory in most computers. A petabyte (PB) is a larger unit of memory. Today, personal computers do not have that much memory...yet! See how much a petabyte can hold!
- 1 PB = 500 billion pages of standard typed text
- 1 PB = 20 million 4 drawer filing cabinets filled with text
- 1 PB = 13.3 years of HD-TV video
- 1 PB = Over 4,000 digital pictures per day for your entire life