Procedure. 1  Start with a short lecture on the nature of solid, liquid, and gaseous water. 2  Your goal is to give some understanding that water molecules themselves don't change when the state of the matter changes, but that the interaction between molecules changes.
Check out our guide of what to toss when. Is your important paperwork piling up? Check out our easy-to-use chart to see what to keep, what to toss, and how to store those hard-to-replace documents. Keep tax returns, as well as supporting documents like W-2 forms, receipts, and real estate closing statements for seven years.
But some tax records need to be kept longer. Copies of prior tax returns and elections they contain should probably be preserved indefinitely. Records supporting the cost basis in assets owned, such as buildings and long-lived equipment, should be retained until at least three years after the asset is disposed of.