If you don't want to use Excel to create a chart/graph, this online tool lets you build one by inputting your data and selecting a number of formatting options. Then, you can save the graph as an image file (like a JPG or BMP) and insert that image into your work.
Here, you can convert many different units of measurement. You can convert non-metric units to metric ones, or even within systems, like metric-to-metric.
Check out this link for a TON of science simulations in areas of biology, chemistry, physics, and more. It's HOURS of fun for the whole family!
What will be the population of the future? Follow the United Nations scenario or build your own scenario. NOTE: The UN scenario only projects to the year 2100, so if you'd like to project farther into the future, use the "free simulator."