Traditional wet and dry saunas use heated air to warm the body, which means they typically have to be uncomfortably hot to reach therapeutic levels. Infrared saunas, on the other hand, penetrate into tissues directly, causing the body to sweat at a more comfortable ambient temperature. Sauna Benefits. But why is it so important to sweat?
Between 1932 and 1964, quarters were 90% silver and 10% copper. These silver quarters look like any pre-state quarter 25-cent piece, but are worth a lot more if they're in the right condition.
Nearly all US quarters dated 1964 and earlier â¦ have been removed  from circulation because they're worth far more for their silver  content. Any quarter from the 1930s is worth a minimum of 10 times  face value, possibly more depending on condition and mint mark.    Quarters dated 1965 and later are made of copper-nickel so they're  only worth 25 cents.