Archive for the ‘Science’ Category

Stargazing

Tuesday, June 19th, 2012

stargazing

Stargazing is a wonderful evening activity for your entire family. Try to go outside the city to adjust your eyes to the dark. The further away from the city lights you are, the better. Before you leave home, look up and make sure there are no clouds.

Take a sleeping bag to open up on the ground. A sleeping bag is better than a blanket because it’s waterproof on the outside, so if the ground is wet, it won’t soak through. A sleeping bag is also softer on the inside than most blankets. You will also want a flashlight with red cellophane taped over it, to look at a star chart. It takes a few minutes for your eyes to adjust to the dark, so turn off your headlights and don’t use any light except red light, which doesn’t affect your eyes.

Start by looking for the Big Dipper. The Big Dipper points to the North Star, and you can find all the other constellations from there. Orion is easy to pick out in the sky as well. Look for his belt first (the three lined-up stars), then his shoulders and legs. See how many constellations your kids can find.

You may want to borrow a telescope or some binoculars to see star clusters, nebulae, or planets. We have seen the moons on Jupiter and the rings on Saturn with our telescope. On nights with a full moon, we just focus on the craters of the moon, since the light of the moon makes it hard to see the stars, even if the night is clear.

Flower Experiment

Tuesday, May 29th, 2012

flower-experiment

Here is a fun flower experiment: Grab some colorful construction paper, and cut a flower shape in four different colors: blue, green, red, and yellow. Grab four bottle caps, and put sugar water into each. Place the construction paper flowers into each of four clear glasses, with the full bottle caps in the centers. Then put them outside, and watch which bottle cap gets drunk out of the most by bees and butterflies. For some reason, the red color attracts insects more than the other colors…

My Favorite Science Websites

Sunday, May 6th, 2012

favorite-science-websites

These are some of my favorite science websites:

  • Periodic Table Song– Scroll down and listen to the Chemistry Element Song. Go on… Do it right now. The periodic table will never be the same…
  • Science Experiments You Can Do at Home – Science experiments with clear descriptions.
  • All About Birds – Click on a picture of a bird, read a description, and listen to the bird call.
  • Free Creation Science Videos – Creation science videos for older kids who can watch lectures.
  • Answers in Genesis Free Kid Videos – Creation science videos for younger kids. My kids enjoyed watching the 9-part series of Dangerous Journey, a kid version of Pilgrim’s Progress. Even though it technically wasn’t an animated cartoon, my kids still liked it.
  • DNA Tube – Some of these videos might contain evolution, but you can find outstanding videos for upper-level science here.

Extracting DNA

Thursday, April 12th, 2012

extracting-DNA

My husband did an experiment with my kids the other night. We had fun extracting DNA from an onion. My 8-year-old son Nathaniel received a DNA kit as a gift, so he was eager to try one of the experiments. First we cut an onion into small pieces, and the kids mashed it in a glass measuring cup. We added half a cup of warm water. Then we added 5 ml of powdered detergent. We stirred it.

extraxting-dna

Next we filled a bowl with hot water. We measured the temperature with a thermometer, adding cold water until it was 50 degrees Celcius. We put the measuring cup with the smashed onion bits into the hot water. Then we set the timer for 12 minutes.

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We added hot water as needed, to keep the mixture at 50 degrees, stirring from time to time. Also, we got a second bowl and filled it with ice cubes and water.

Ding. (The timer went off.) We took the mixture out of the hot water and put it into the cold water. We set the timer for 5 more minutes.extracting-dna-3

Ding. We grabbed a coffee filter and stuffed it into a funnel. Then we poured the onion mixture through the filter and funnel, and into a glass. The gunk trapped in the filter included “cell walls, cell membranes, and cytoplasmic leftovers, but not the DNA from the cell.” The DNA passed through the filter.

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We poured the DNA liquid (called supernatant) from the glass into a test tube, filling the tube halfway. We added a pinch of salt, then dripped chilled (denatured) alcohol down the side of the tube, filling the other half of the test tube. We screwed the cap onto the tube and rocked it back and forth like we were dancing with a maracas. We placed the tube in the freezer and waited at least 10 minutes, tapping our feet impatiently.

Ding. Oh my goodness! The white gloppy stuff is DNA! It feels gooey like mucous, and and it’s stringy, like it has formed chains!

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My husband also helped my kids put together a DNA chain with the plastic snap-together DNA pieces. He looked at me and said that he gives this Science Wiz DNA kit a thumbs up. The colorful instructions were easy to follow, and the experiments were fun.

extracting-dna-6Linked to Science Sunday at Adventures in Mommydom:

Science Sunday