Wednesday, May 28, 2008

Science Experiments For Kids

In high-school science was always one of my favorite subjects. I was one of those students always pestering the teacher with questions about why stuff happens. As I was cleaning out some of my stuff last week, I found a collection of my science experiments for kids. As they don't really help me anymore, I have decided to post a couple here.

So here are some of my science experiments for kids

Baking Soda and Vinegar Rocket

Equipment -

  • Baking Soda
  • Vinegar
  • A one liter Bottle

Method -

  1. Fill the bottle with about an inch of vinegar
  2. Fill a small bag with baking soda and loosely seal it
  3. Put the bag in the bottle
  4. Put the lid on the bottle
  5. Shake for 5-10 seconds
  6. Throw and run!

Baking Soda Volcano

Equipment -

  • 6 cups flour
  • 2 cups salt
  • 4 tablespoons cooking oil
  • Plastic soda bottle
  • A deep dish
  • Warm water
  • Red food coloring
  • Detergent
  • 2 tablespoons baking soda
  • Vinegar

Method -

  1. Mix 6 cups flour, 2 cups salt, 4 tablespoons cooking oil, and 2 cups of water to get a smooth and firm mixture
  2. Stand the bottle in the dish and mould the mixture into a volcano shape. Do NOT cover the hole or allow anything inside it
  3. Fill the bottle about 2/3 of the way with warm water that has had red food coloring in it.
  4. Add 6 drops of detergent into the bottle
  5. Add 2 tablespoons of baking soda
  6. Slowly pour vinegar into the volcano
  7. Watch

Invisible Ink

Equipment -

  • Baking Soda
  • Paper
  • Water
  • Paintbrush or Swab

Method

  1. Mix equal portions of baking soda and water
  2. Using the paintbrush, write a message on paper, using the mixture
  3. Allow time to dry
  4. Hold the paper near something hot (like a light bulb) to make the ink turn visible

Ben Barclay has had lots of experience with science during his many studies and loves to blog about it on his website http://scienceexperimentsforkids.googlepages.com/home which is highly recommended to all

What Are the 39 Types of Sharks Known to Harm Humans?

What are the 39 types of sharks known to harm humans? Well, as soon as you read this question, your mind probably started racing, your heartbeat became more rapid and your throat dried out. The question that probably consumes your thoughts right now is: Are there that many dangerous species of sharks out there?

Well, calm down. Yes there are 39 types of sharks known to have harmed humans but only three species were actually involved in unprovoked shark attacks. No, Jaws itself, better known as a Great White shark was not one of these species. Surprised? In fact, out of 1190 shark attacks between 1580 and 2005, there were only 3 provoked shark attacks, one being fatal. Each of the following species was involved in one shark attack: the Hammerhead shark, the Blue shark and the Shortfin Mako shark. The fatal attack was done by the Hammerhead shark.

So according to the ISAF (International Shark Attack File) between 1580 and 2005, there were 1187 unprovoked shark attacks done by 36 types of sharks. In fact, 17 of the 36 species involved in unprovoked shark attacks were responsible for 5 shark attacks or less. These types of sharks are: the Galapagos shark, the Tope shark, the Silvertip shark, the Spiny Dogfish shark, the Tresher shark, The Bignose shark, the Smooth Dogfish shark, the Basking shark, the Horn shark, the Sixgill shark, the Whale shark, the Greenland shark, the Whitetip Reef shark, the Porbeagle shark, the Leopard shark, the Mako shark and the Great Hammerhead shark.

Of the remaining 19 types of sharks known to harm humans, 6 types of sharks are responsible for 6 to 9 unprovoked shark attacks. These are the following species: the Grey Reef shark, the Oceanic Whitetip shark, the Sandbar shark, the Sevengill shark, the Dusky shark and the Silky shark.

Of the 13 types of sharks that are left, 3 species are responsible for 14 to 19 unprovoked shark attacks. These are the following types of sharks: the Spinner shark, the Blacktip Reef shark and the Bronze Whaler shark.

Of the 10 types of sharks that have been involved in 23 to 27 unprovoked shark attacks on humans, you have the 3 following shark species: the Lemon shark, the Caribbean Reef shark and the Wobbegong shark.

Now you have the top ten sharks that have been known to attack humans, 7 species are responsible for unprovoked shark attacks while 3 species that were mentioned earlier on this page have been involved in provoked shark attacks. The 7 species are: the Great White shark, the Tiger shark, the Bull shark, the Sand Tiger shark, the Requiem shark, the Nurse shark and the Blacktip shark.

The top 10 species are: the Great White shark (#1), the Tiger shark (#2), the Bull shark (#3), the Sand Tiger shark (#4), the Requiem shark (#5), the Nurse shark (#6), the Shortfin Mako (#7), the Blacktip shark (#8), the Hammerhead shark (#9) and the Blue shark (#10). The numbers of shark attacks done by these species vary between 36 and 410.

As you can see, the 20% types of sharks involved in shark attacks may seem impressive but not as alarming as you may have thought at first.

My name is Sylvie Leochko. My fascination with sharks encouraged me to research the various types of sharks that roam in our oceans and seas. Amongst these species, I was amazed to discover that the largest fish in the world is not only a shark, known as the whale shark, but it also is feeding on plankton but is still on this list for unprovoked attacks on humans. Interested to find out more information about types of sharks? Then I strongly suggest that you follow this link: http://sharks.findoutnow.org/types-of-sharks.html .

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