Mad Maggie's Ice Cream in North Andover is celebrating 20 years of making and serving ice cream. TIM JEAN/Staff photo Customers wait in line at Mad Maggie's Ice Cream in North Andover.

We're turning down the temperatures and turning up the learning. Andrea Cook shows how science can carve tunnels through ice and even create instant ice cream.

''Mad' dessert and ice cream café with doughnut sandwiches to open in former city centre lasagne spot The new café, doughnut and ice cream bar opens this weekend. What's On.