Source first US case: https://www.ajmc.com/view/a-timeline-of-covid19-developments-in-2020
Source Moderna trials: https://www.biospace.com/article/moderna-s-covid-19-vaccine-clinical-trial-starts-today/
Source child covid: https://data.cdc.gov/NCHS/Provisional-COVID-19-Deaths-by-Sex-and-Age/9bhg-hcku