Motivation | download_data | Parameters | Standard parameters | Function Structure | 1. Clean parameters | 2. Generate download URLs and destination file paths | 3. Validate URLs | 4. Download files with httr2 | 5. Zip files (if applicable) | Unit Tests | Helper functions | testthat | Download Example | download_hms function code

Why parallelize amadeus workflows? | Reference: sequential purrr baseline | Parallel with future + furrr | Parallel with mirai | Reproducible pipelines with targets | Caveats and gotchas

Motivation | NASA EarthData Account | Approved applications | Generating a NASA EarthData Token | Setting Up Authentication in R | Recommended: persist in ~/.Renviron | Save to a token file | Current session only | How amadeus Uses the Token | References

Setup | Chemicals | External exposure | Get chemical identifiers from CompTox Dashboard | Active chemicals | Dose-response | Population | Age | Obesity status | Steady-state plasma concentration (C_ss) | Retain overlap | County/State boundaries