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How to Use the Mnemonic 'SOHCAHTOA' in Trigonometry
science.howstuffworks.com/math-concepts/sohcahtoa.htm
The mnemonic device SOHCAHTOA helps budding mathematicians remember the trigonometric functions sine (sin), cosine (cos) and tangent (tan), which they need to solve for triangles' missing sides and angles.
Why Do Most Humans Have 23 Pairs of Chromosomes?
science.howstuffworks.com/life/genetic/23-pairs-chromosomes.htm
Nearly every living cell is made of DNA, and every chromosome contains exactly one molecule of DNA. But not all cells are made of the same number of chromosomes.
Can you name these muscles of the body?
play.howstuffworks.com/quiz/can-you-name-these-muscles-the-body
Your body works hard every day. But do you know the muscles that make your body move? Take this quiz to find out how well you know the muscles that allow you to work, play and survive.
The Fallout Video Game Quiz
play.howstuffworks.com/quiz/fallout-quiz
Strap on your Pip-Boy and crack open a cold Nuka Cola, it's time for a "Fallout" quiz.
When Abortion Was Illegal, Women Turned to the Jane Collective
people.howstuffworks.com/jane-collective.htm
HowStuffWorks looks back at the days when safe abortions were nearly nonexistent and at the collective of women who stepped in to provide them.
How to Calculate the Percent Error Formula
science.howstuffworks.com/math-concepts/percent-error-formula.htm
We take the mystery out of reporting the percent error correctly and show you how to use it in real life.
22 Angel Number Meaning: Love, Twin Flame, and Spiritual Significance
science.howstuffworks.com/science-vs-myth/extrasensory-perceptions/22-angel-number.htm
Unlock the powerful meaning of angel number 22—discover the secrets behind this master number, its impact on love, manifestation, and your spiritual journey.
What is the difference between analog and digital cell phones?
electronics.howstuffworks.com/question31.htm
There are two main digital systems in the U.S. One is generically known as "digital service," and the other is clearly branded as "PCS."
What Is the Linea Nigra of Pregnancy?
What is the linea nigra? HowStuffWorks looks at the dark line of pregnancy.
How Your Heart Works
health.howstuffworks.com/human-body/systems/circulatory/heart.htm
The heart is a vital organ that basically serves as a pump. Learn about heart chambers and valves, blood flow, heart's electrical system and blood supply.