Dear School Board and Superintendent Bob Brightbelt,
I remember you hiring my class to discover the contents of a so-called mystery powder that landed on the playground of Dexter High School in Breckenridge, Colorado. (The powder was white and landed in the spring).
I used some tests with six powders, such as mixing Phenol Red with baking soda and corn oil with salt. My wonderful teacher, Mrs. Tate, helped us figure out that four liquids were called indicators and that is how the experiment began. Indicators are things that when mixed with powder helps you decipher what the powder is.
The four indicators are the following: Iodine, Phenophthalein, Phenol red (PR) and Vinegar.
First I mixed the mystery powder with Vinegar and the result
was it slightly bubbled. That meant it could only be baking soda because it was
the only powder to bubble with vinegar. Mystery Powder (MP), mixed with Iodine
turned blackish bluish (that meant that it was a starch, corn
starch). MP mixed with Phenolphthalein turned
pink (that means that it was not an
acid because an acid would turn yellow). The MP and salt both had the same
reaction so the last powder is salt.
This is a story of how I think the powder got to the
playground. First, there was a truck making a shipment full of baking soda
and salt. It was trying to get to a bakery and it was rush hour so the
driver took the alley that goes behind the school house. The driver was speeding
so he could not stop fast enough and ran into the curb. The back doors
exploded and baking soda and salt spilled into the playground. He was also
carrying cornstarch and that is what happened. 
I am so glad that I could help you find out the contents of the Mystery Powder and
that you will hire me again. Oh yeah, you forgot to give me my check for one
million dollars because I found out what was in the mystery powder. I'll
look forward to receiving it!
Sincerely,
Patrick