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Anne Helmenstine's Most Recent Content

By Anne Marie Helmenstine, Ph.D., About.com

The blue glow is characteristic of luminol chemiluminescence.

You can use luminol to make your own glowstick or to test for blood.

David Mülheims, Wikipedia Commons
Most Recent Features...

07/17/08 - Glowing Bubbles
Bubbles are already awesome, but glowing bubbles are even better. It is easy and safe to make bubbles glow, plus it doesn't require any hard-to-find materials. Here is what you do.

07/12/08 - How to Remove Rust Stains
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles, plus some treatments actually set the stain rather than remove it. Use a little chemistry know-how to successfully remove a rust stain.

07/09/08 - How to Remove Ball Point Pen Ink
Ball point pen ink is not a something that you can usually remove with simple soap and water, but there is an easy and inexpensive way to remove pen ink from surfaces or clothing.

07/05/08 - Honeycomb Candy Recipe
Honeycomb candy is an easy-to-make candy that has an interesting texture caused by carbon dioxide bubbles getting trapped within the candy.

07/04/08 - Table of Physical Constant
Need a value for a fundamental physical constant? This handy reference table contains commonly used physical constants used in chemistry.

07/01/08 - English to Metric Unit Conversion
Here is a worked example of how to convert English to metric measurement units using the unit cancellation method. This example converts yards to meters.

06/29/08 - Unit Cancelling Example
Here is a step by step example of a conversion between metric units. This illustrates how to cancel units to convert measurement units.

06/26/08 - Rubber Egg & Chicken Bones
You can make a hard boiled egg bounce like a rubber ball and cause chicken bones to become soft and rubbery. All you need is a common kitchen ingredient.

06/25/08 - Robert Hooke Biography
Robert Hooke has been called the English Da Vinci. He is credited with numerous inventions and design improvements of scientific instrumentation. He was a natural philosopher who valued observation and experimentation.

06/25/08 - Caffeine & Typing Speed - Science Fair Projects
The purpose of this science fair project is to determine whether caffeine affects typing speed.

06/24/08 - Fizzy Potion Recipe
Make a non-toxic fizzy Mad Scientist potion using ingredients from your kitchen. The potion looks evil, but it is safe enough to drink.

06/22/08 - Safe Smoke Bomb
A classic smoke bomb is easy to make and safe to use, but you can make the project even safer if you don't heat the ingredients. Here's what you do.

06/20/08 - Why Is lb the Symbol for Pounds?
Have you ever wondered why lb is used as the symbol for the pounds unit? Here's the answer to the question.

06/19/08 - Derived Metric Units
Many metric units used in science have specialized names for the values they represent. They are considered derived units and can still be reduced to factors of the seven base units. This table lists many of these units and their corresponding base unit values.

06/19/08 - Metric Base Units
The metric system or SI (from Le Système International d'Unités.) is based on seven base units. These units describe the basic properties on which all other measurements are based.

06/18/08 - Greek Alphabet
The Greek Alphabet is used extensively in science and mathematics to represent variables and symbols. This table lists all twenty four Greek letters in upper and lower case. Learning the names of these letters is easy and you may be surprised you already know many of them.

06/18/08 - Sharpie Pen Tie Dye
You can create a pattern resembling tie-dye using colored Sharpie pens and rubbing alcohol. It's a fun and educational project that is great for kids.

06/15/08 - HTML Codes - Greek Alphabet
Here is a table of HTML codes for Greek letters used when creating web content for science and mathematics.

06/15/08 - HTML Codes - Math Symbols
A table of commonly used mathematical symbols used in creating html web content for science and mathematics.

06/15/08 - HTML Codes - Scientific Symbols
Here is a table of commonly used symbols used in creating html web content for science and mathematics.

06/14/08 - Metric Unit Prefixes
Metric units of measurement are all based on units of ten. Here is a list of the most common metric unit prefixes.

06/14/08 - Metric Prefixes Quiz
How well do you know your metric prefixes? Quiz yourself with this ten question multiple choice self-test.

06/12/08 - Ideal Gas Quiz
Do you understand the ideal gas laws? Here's a ten question quiz you can take to test your knowledge.

06/11/08 - Biodiesel from Vegetable Oil Tutorial
As the price of diesel continues to climb, you may wish to consider making your own diesel from cooking oil, called biodiesel. It's easy and could save you money.

06/09/08 - Periodic Table Trends Quiz
Do you understand the trends of periodic table periodicity? Here's a ten question multiple choice quiz you can take to test your knowledge.

06/09/08 - Stink Bomb Recipes
Stink bombs smell terrible, but they are also fun. Here are instructions for how to use everyday materials to make your own stink bombs.

06/09/08 - Elements in Fireworks
Learn about the functions of the chemical elements in fireworks.

06/09/08 - Fireworks Photo Gallery
Take a look at some fireworks, sparklers, firecrackers and other pyrotechnic devices.

06/05/08 - Area & Volume Formulas
Here's a handy reference with formulas for perimeter, surface area, and volume of many common figures.

06/04/08 - Glow in the Dark Photo Gallery
See examples of different types of luminescence and materials that glow in the dark.

06/03/08 - Mentos & Tonic Water Glowing Fountain
It's easy to make a mentos and soda eruption glow. All you need to do is use tonic water or diet tonic water instead of the usual diet soda and shine a black light on the fountain.

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