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Could you dig a hole all the way to the Earth's mantle?
science.howstuffworks.com/environmental/earth/geophysics/dig-hole-to-earths-mantle.htm
Have you ever read "Journey to the Center of the Earth" and wondered if it were possible to do it? Well, scientists are in the process of giving it their best shot. How hard is it to dig a hole this deep, and what might they find?
What is dental plaque?
health.howstuffworks.com/wellness/oral-care/problems/dental-plaque.htm
Plaque is a nasty bugger that likes to hang out on our teeth. Learn all about dental plaque in this article.
How Tessellations Work
science.howstuffworks.com/math-concepts/tessellations.htm
Mathematics achieves the sublime. Sometimes, as with tessellations, it rises to art. In their simplest form, tessellations consist of a single shape that repeats over a two-dimensional plane without any gaps. Why was M.C. Escher so fixated on them?
How Efflorescence Works
home.howstuffworks.com/home-improvement/construction/materials/efflorescence.htm
Even Michelangelo had to deal with efflorescence -- white deposits that appear on masonry -- while painting the Sistine Chapel. What causes this unsightly problem, and how can you address it if it shows up on the surfaces of your home?
How a Flea Circus Works
entertainment.howstuffworks.com/arts/circus-arts/flea-circus.htm
Flea circuses with live, performing fleas actually do exist. Find out how flea circuses work and the history behind this unusual circus art.
How Cave Biology Works
science.howstuffworks.com/life/biology-fields/cave-biology.htm
Cave biology is the study of the animal specimens that live and evolve in caves. Learn about cave biology and cave animals in this article.
How Mirrors Work
science.howstuffworks.com/innovation/everyday-innovations/mirror.htm
Mirrors are explained in this article from HowStuffWorks. Learn about mirrors.
Aspirin 101
health.howstuffworks.com/medicine/medication/aspirin.htm
Aspirin and its relatives are used to relieve all kinds of ailments. Learn about the history and chemistry of aspirin, how aspirin works against pain and aspirin side effects.
How Tuning Forks Work
science.howstuffworks.com/tuning-fork.htm
Pianos lose their tuning, guitars fall out of key -- even church organs need to be tuned every now and then. For centuries, the only sure-fire way to tell if an instrument was in tune was to use a tuning fork.
Ringworm Overview
health.howstuffworks.com/skin-care/problems/medical/ringworm.htm
Ringworm in a common skin problem. Learn more about how ringworm works at HowStuffWorks.