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.
1964 was the last year the US minted dimes and quarters from silver for regular circulation. The US Mint makes proof sets every year that have silver coins in them, which you can buy from the US Mint or a local coin dealer. Also, look out for silver halves, which were last made in 1964 as well at 90% silver. Then remember to look for 40% silver halves between 1965 & 1970.