June 13, 2007
wildflowers that grow in our lawn: common
dwarf cinquefoil, and hawkweed.
There's an unusual pink-and-yellow columbine
blooming in the garden.
Saturday was the Greenfield Historical Fair in Oak
Park. There were craft vendors, a blacksmith, a fiddler, Civil War reenactments,
and refreshments. Here's
a page of pictures.
Monday we went to grandson Alex's first
performance His nursery school has a year-end party, and the kids sang
and danced to a recording. At one point the teacher tells Alex
to face forward; she hasn't seen the boy behind him fooling with Alex's
I've been volunteering at Jaffrey Elementary School
once a week to help some fourth-graders on a science project. It's
a Rube Goldberg
invention to put a Graham cracker on a s'more sandwich. Tuesday we
demonstrated it to the school. In the video,
you can see a boy rising from a chair, releasing a "rocket"
down a string that knocks over some blocks that start a couple balls
rolling that knock a stick that knocks a marble down a track to trigger
a mouse trap that pulls a string that starts some dominos falling up a
ramp that knock over a water bottle that fills a cup that tips the
cracker onto the sandwich (lower right).
Feature - In 1983 Bill
Roadstrum and I wrote an electrical
engineering textbook. The approach was to describe the big
picture first and go to ever-finer detail. We published a paper
describing this approach, comparing the teaching of electrical
engineering to drawing a horse or following a dinner recipe.
Quote for the Day -
"There are three kinds of men: the ones that
learn by reading, the few who learn by observation, and the rest
of them have to pee on the electric fence and find out for themselves."
- Will Rogers