# data[].attributes.body
Robert Hook names the "cell".

# data[].attributes.body
An improved microscope enables scientists to view microorganisms.

# data[].attributes.body
The first vaccine, which protected people from smallpox, is discovered.

# data[].attributes.body
Schleiden and Schwann discover that all living things are made up of cells.

# data[].attributes.body
Scientists discover the structure of DNA.

# data[].attributes.body
Scientists clone a living organism-a sheep-by implanting the nucleus from a body cell of an adult sheep into a fertilized egg cell.

# data[].attributes.body
Scientists finish a rough draft that describes about 3.5 billion chemical pieces that make up all of human DNA.