HW for Monday (F) and Tuesday (A)

Look up the SI standards for time and mass.  Write down a short version.

Also:

Read my old blog posts for homework.  Write down anything you find interesting, or any questions you may have.

http://howdoweknowthat.blogspot.com/2009/07/how-do-we-know-that-earth-is-spherical.html

http://howdoweknowthat.blogspot.com/2009/07/so-how-big-is-earth.html


And if you have time:

http://howdoweknowthat.blogspot.com/2009/07/how-far-away-is-that.html