Here is an old Christmas song to warm your hearts:

OH B-O-D (to the tune of O Tannenbaum)

Oh B-O-D, Oh B-O-D, You are so biochemical

A little sample and then some seed.  So plain yet diabolical

To set you up is such a breeze.  Just five short days at 20 degrees

Oh B-O-D, Oh B-O-D.  Pray the blanks don’t deplete on me.

First get the bottles all lined up.   Then calibrate the meter

Aerate the water; prep the seed.  And don’t forget the Winkler

Pipet your samples in “just so”.  Make sure they have enough D.O.

Now load the samples on a cart.  Incubate them five days in the dark.

If Wednesday morn you put them in.   Next Monday all your woes begin

All the dilutions that you tried.  Were either too low or else too high

All your controls are out of range.  The calculations just too strange

Oh B-O-D you are so great.   The test that we all love to hate