well it depends on situation. if you have a psp dont but if you dont i consider you to buy but if you have a ds lite its 70$ off. if you have the old ds the first one its 50$ off.so i highly consider...
Metric is definitely better. Its advantages are that (1) It is an international standard, (2) calculations are much easier, and (3) the units are compatible with one another.
That really depends upon the application. It seems that biologists tend to prefer the Windows operating system. People are familiar with it, and some of the genome projects make use of databases that...