Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The (normalized) maximum number of unique users vs. the fraction of users selected for some of the largest cascades in different countries. Data are: blue (Mexico, Δ = 1 hour); light blue (Brazil, Δ = 4 hours); and orange (Venezuela, Δ = 4 hours).
