Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Sound travels fifteen times faster through steel than through air.
134
Research indicates that plants grow healthier when they are stroked.
173
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Iron weighs more after it rusts.
68
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7