One of the most complex parts of this process is lithography: the step in which shapes are drawn onto a silicon ... In his best runs he managed to draw lines with a width of about 100 nanometers ...

Save guides, add subjects and pick up where you left off with your BBC account. When you draw a shape, think about: How many sides it has. How long each side is. How many angles or corners it has.

You can draw freely in Microsoft Word using the "Draw" feature whether you have Word for Mac or Windows. You can also insert customizable shapes into your document, or draw using the "Scribble ...

However, don't lift your finger after you finish drawing -- instead, hold your finger down for a few seconds, and whatever shape it is that you drew will be replaced with a perfect version of it.

Save guides, add subjects and pick up where you left off with your BBC account. When you draw a shape, think about: How many sides it has. How long each side is. How many angles or corners it has.