The timeline can be zoomed by dragging the vertical slider at right top corner. Up for zooming in (less time shown) and down for zooming out (more time shown).
The user can use the mouse wheel as a zoom controller.
Any white area on the "stage" of the timeline can be dragged left and right, as can the blue "ruler" which marks out different units of time.
Clicking on an event brings up a small modal window with a description and links if any are provided in the data.