A temporal network records interactions as timestamped events (u, v, t). Unlike static graphs, time-respecting paths require edges to be traversed in increasing time order — so reachability depends on timing, not just topology. Burstiness B = (σ_τ − μ_τ)/(σ_τ + μ_τ) measures inter-event time variability: B=0 is Poisson, B>0 is bursty (heavy-tailed). Real human contact patterns are highly bursty (phone calls, emails), which slows spreading despite high static connectivity. The timeline (bottom) shows active contacts; the main panel shows the current time-window subgraph.