Year: 2010 (Page 25 of 70)

Seed of the Week: Lemon Tree

More people would probably have recognized the mystery seeds from last week as lemon seeds if I had used this photograph:

lemon-seeds

Lemon trees, Citrus limon, grow where there is little chance of frost.

Here in Phoenix, Arizona they flower from late February to March.

lemon-flower-bee-flying

Honey bees love the flowers.

lemon-bee

The flowers are incredibly fragrant.

lemons- two-green

Right now the tree is loaded with green lemons.  A wise citrus grower once told me that the lemons are often ripe inside before their rinds are fully yellow outside. In any case, the green ones have a pleasant lime-like odor.

lemon-fruit

The fruit will be turning yellow by November. The fruit stays on the tree until after it flowers in March.

As I mentioned in a previous post, citrus trees can produce seeds that are identical to the parent without pollination. You can grow new trees from the seeds.

lemon-leaves

The leaves are simple and oval and stay on the tree throughout the year. In fact, we have used lemon tree leaves for out tree leaf age experiment.

lemon-tree-bark

The bark is gray and relatively smooth.

Lemon trees tend to produce large quantities of fruit. If you grow a lemon tree, it pays to have a lot of recipes at the ready.

One of our favorites comes from my cousin Karen.

Glazed Lemon Bread

  • 3 Tbsp. oil
  • 3/4 cup sugar
  • 2 Tbsp. lemon juice
  • 2 eggs
  • 1 and  3/4 cups flour
  • 2 and 1/2 tsp. baking powder
  • 1/2 cup milk (soy or rice works too)
  • 1 Tbsp. grated lemon rind
  • 1/2 tsp. salt (optional)

Glaze:

  • 1 Tbsp. lemon juice
  • 2 Tbsp. sugar

Preheat oven to 325 ° F. Grease an 8 by 4 by 2 loaf pan.

In a standard mixing bowl, mix oil and sugar, and then stir in lemon juice. Add eggs one at a time.

Sift together flour and baking powder. Add to oil/lemon mix alternately with milk. Add the lemon rind and mix thoroughly.

Turn out batter into greased loaf pan and bake 45 minutes. Prepare the glaze of lemon and sugar in a small bowl. At 45 minutes, remove the lemon loaf from the oven (it will be hot), and brush or drizzle evenly with the glaze. Return to the 325°F oven for another 5 minutes.

Serve with lovely hot tea with a twist of lemon.

Lemons are also an inexpensive source of mild acid for fun science experiments.

As another science experiment you could test whether you really need to add salt to baked goods. Make one loaf of lemon bread with the salt and one without. See if you notice any differences. (I tend to leave the salt out).

What is your favorite recipe that uses lemons?

Weekend Science Fun: Water Sloshing

This morning I asked myself a simple question:  “Why, when I’m carrying the cat’s full water bowl up the stairs, does the water slosh over at the top step?”

A question like this can often generate some interesting science.

Gather:

  • a couple of sturdy mixing or soup bowls with sloped sides, at least two different sizes
  • a straight-sided bowl, such as a casserole dish
  • water
  • metronome (optional)
  • water-proof clothing such as a rain jacket (if it is cold out or if the children can’t change clothes if they get wet.)
  • measuring cups (optional)

This is probably best done outside where a little spilled water won’t be a problem. First fill one bowl with water and see what happens when you walk with it held out in front of of you. Does the water begin to move back and forth? What happens when you stop?

Now compare that with a bigger or smaller bowl. Does more water go out over the edge with a big bowl or a small bowl? What about slope sides versus straight sides?

If you have a metronome, try walking at a constant slow pace versus a constant fast pace. See any differences?

You can actually make this more scientific by measuring the amount of water you put into the bowl and how much you have at the end with liquid measuring cups.

What we are seeing is the resonance, or the swing, of the water. When the swing gets big enough, over the edge it goes. This may not seem so important until you realize that the same sorts of forces are acting on the waves and tides of the oceans.

My son suggests I carry the water up the stairs in a straight-sided pitcher. Based on your studies, what do you think of that idea?

waves

Perseid Meteor Shower: August 12 and 13, 2010

Everyone ready to go watch the Perseid meteor shower? According to EarthSky, the best times for viewing  are predicted to be the mornings of August 12 and 13.

Tips:
1. Try to find a place that is dark for best viewing. Porch and street lights can fade out the meteors.
2. Remind your children there may be several minutes between sightings. In the wee hours of the morning it can be hard to be patient.
3. Blankets and lawn chairs that allow for viewing in a prone position help prevent neck strain.

Here’s an informative video about last year’s shower:

More tips for watching meteor showers from NASA

Let us know what you see.

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