20th Century (1 janv. 1901 – 31 déc. 2000)
Description:
- Conjoined (Siamese) twins were separated successfully for the first time in 1953
- Acquired immune deficiency syndrome (AIDS) was identified as a disease in 1981
- Walter Reed demonstrated that mosquitoes carry yellow fever in 1900
- The human imunodeficency virus (HIV) causing AIDS was identified in 1984
Average life span was 60 to 80 years
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