rickets occurs when the body has a severe lack of vitamin d during the developmental years vitamin d is essential to the development of strong healthy bones
A clothes dryer should last an average of 10 to 15 years, according to consumer products experts.
Appliance half-life is defined as the number of years after which it would not be cost-effective to repair half of the appliances in the group. For example, if the half-life of all dryers is 13 years, this means that in a group of 10 dryers, all 13-years old, it would be cost-effective to repair only five of them. The other five would be too badly deteriorated from abuse, poor quality, heavy use...whatever, to cost-effectively repair them.