Did you know that Google can convert almost any unit for you?  Metric, standard, measurements, volumes, weights, time, you name it…
This can help you with science homework (and even some other things like cooking or calculating large numbers).  Just type it in and see what happens.  Here are a few examples…

That last one is useful [...]

One of my biggest gripes about the school system in the United States is that it teaches children to “do their own work”.  
Sure, I understand the reason behind it.  We don’t want kids copying off each other on the test and skipping out on learning!  But is it possible we’ve gone too far?
You see, [...]