One 75-watt bulb gives more light than three 25-watt bulbs.
57
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
The smell of freshly cut grass is actually a plant distress call.
31
Iron weighs more after it rusts.
68
Aluminum used to be more valuable than gold!
84
Research indicates that plants grow healthier when they are stroked.
173
