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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.
Everyone has one nostril that is larger than the other.
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
![Earth’s history spans 4.5 billion years. Geologists and paleontologists have pieced together the his](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_24_30_2057231.jpeg)
![Rock layers (strata) usually look like layers in a cake such as these strata at Olduvai Gorge Tanzan](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_26_13_205831123.jpeg)