This machine makes cold brew coffee in less than 10 minutes
 

Cold-brewed coffee is delicious. It's about two-thirds less acidic than coffee brewed with hot water, which results in a cleaner, smoother and less bitter taste. Unfortunately, making cold brew coffee is a pain. You typically have to let the grounds...

http://www.engadget.com/2016/04/21/pique-cold-brew/