# data[].attributes.body
Abacus - Beads on rods to count and calculate

# data[].attributes.body
Slide Rule - Based on Napier's rules for logarithms

# data[].attributes.body
Jacquard Loom - First stored program - metal cards

# data[].attributes.body
1st generation computers used Vacuum Tubes with no air inside to protect circuitry

# data[].attributes.body
First Computer Bug - Moth stuck in relay switch. Grace Hopper called it debugging a computer

# data[].attributes.attachment_link.title
History Snapshot: The first computer bug was found, 1947

# data[].attributes.body
First Transistor - Used silicon, won Nobel prize, on-off switch

# data[].attributes.body
UNIVAC - first fully electronic digital computer built in the US, Created at the University of Pennsylvania. Weighed 30 tons, contained 18,00 vacuum tubes, Cost $487,000

# data[].attributes.body
2nd generation replaced vacuum tubes with transistors

# data[].attributes.body
3rd Generation computers used Integrated Circuits that were made made of transistors, resistors, and capacitors integrated into one chip

# data[].attributes.body
4th Generation computers had microchips
Intel 4004 Microchip had 2,250 transistors

# data[].attributes.body
Computers in most homes
Faster and less expensive
Windows 95 was 1st decent GUI