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Top 10 Rare Diseases
health.howstuffworks.com/diseases-conditions/rare/10-rare-diseases.htm
Rare diseases are usually genetic, but environmental factors can play a role. Take a look at the top 10 rare diseases that you may never have heard of.
Body Mass Index
health.howstuffworks.com/wellness/diet-fitness/weight-loss/bmi.htm
The number on the scale alone can't tell you whether you're at a healthy weight. Because height is also a factor, scientists came up with a mathematical formula called Body Mass Index (BMI). Learn how to calculate your BMI.
Top 5 Retirement Activities for Men
health.howstuffworks.com/wellness/aging/retirement/5-retirement-activities-for-men.htm
These retirement activities for men provide ideas on fun and beneficial things to do in the senior years. See five retirement activities for men to get started.
How Many Languages Are There? Literally Thousands
people.howstuffworks.com/how-many-languages-are-there.htm
Languages exist as ever-evolving systems of human communication that go beyond complex grammar or words you could learn from a quick search on Google Translate. Language consists of body language, social cues and mother tongue idioms that are shaped by culture and context. That said, how many languages are there in our vast world?
A Guide to Supplements for Seniors
health.howstuffworks.com/wellness/food-nutrition/vitamin-supplements/supplements-seniors.htm
Supplements for seniors can help to control hormones and even protect against cancer. Learn about the pros and cons of supplements for seniors.
Macrodontia Explained
health.howstuffworks.com/wellness/oral-care/problems/macrodontia.htm
Macrodontia causes teeth to grow abnormally large. Learn how macrodontia works and and the complications and care involved.
How the 'Alien' Xenomorph Works
entertainment.howstuffworks.com/alien-xenomorph.htm
You've always wondered how the xenomorph in 'Alien' worked. Now it's time to go behind the scenes and meet the xenomorph in 'Alien.'
How Aquaculture Works
animals.howstuffworks.com/animal-facts/aquaculture.htm
Aquaculture provides food and replenishes other scarce resources. Learn how aquaculture works and how aquaculture industry supplies the goods we use.
Do Sharks Lay Eggs? Surprisingly Not a 'Yes or No' Question
animals.howstuffworks.com/fish/sharks/do-sharks-lay-eggs.htm
You’ve probably heard of shark attacks and shark teeth, but here’s something lesser known and just as intriguing: Do sharks lay eggs? The answer is: it depends on the shark species.
How can some of the world's oldest people also lead unhealthy lives?
health.howstuffworks.com/wellness/food-nutrition/diet-aging/oldest-people-unhealthy.htm
Some of the oldest people have oddly lead unhealthy lives. Learn why some people can smoke until they are 100 and how the oldest people get so old.