I learned from Things I Wish I'd Known Before I Started Sailing that a well-maintained diesel should run for about 5000 hours before needing a major overhaul and that the engine in a recreational boat runs on average 200 hours per year.  Vigor also says that one should run the diesel for 10-15 minutes at full throttle under full load every time it is started.

The caterpillars arrived for our butterfly habitat.  We'll observe and graph their progress over the next weeks as a vehicle to introduce graphing and documenting observations.  We'll give some thought to questions like how many legs the caterpillars have, what happens to the extra legs when they become butterflies, what that peanut-buttery goop is that they eat, and write down our findings.


 
Here are our Singapore Math books: