One 75-watt bulb gives more light than three 25-watt bulbs.
57
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Research indicates that plants grow healthier when they are stroked.
173
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Out of all the senses, smell is most closely linked to memory.
146