By using Excel or Google Sheets to create impactful graphs, you'll be able to captivate your audience, facilitate meaningful discussions, and drive home the key points of your presentation.

In Microsoft Excel, to draw attention to a specific marker in a line chart, drop in a thin line, think of it as a marker.

Select all the data you want to have graphed, click on Insert, pick line graph, and choose which one you want. Excel (2007) automagically grouped date and time on the X axis.