The passing of the Chinese Exclusion Act in 1882 marked the first time the United States prohibited immigration based on ethnicity and national origin.
Abraham Lincoln proclaimed freedom for enslaved people in America on January 1, 1863. Today, we've annotated the Emancipation Proclamation for readers.
Covering concepts from spillover to virus mutation, this collection of free-to-access readings provides scientific context around the COVID-19 pandemic.
Scientists have found that sometimes people infected with measles later develop "immune amnesia": their bodies don't remember being sick, even with other viruses.