Oil on top can act as a short term preservative that holds the moisture in and keeps the oxygen and air out. A lot of traditional recipes were developed long before refrigeration (or antibiotics) existed, when food preservation was a matter of life or death on a daily basis. Many kinds of...
I prefer to use my netbook for classes, since it has a keyboard and I can use the MS Word and other Office apps, which are the most common doc formats for students and professors for assignments. I have an iPad2 and an iPod Touch which I use outside of classes. I use the iPod Touch for Skype...