Though any emotion can be read into Mona Lisa’s mysterious smile, scientists have identified the glint in her eyes as simple lust for dairy products. Tantalize portraits with today’s Groupon to N2 Ice Cream Factory. Choose between the following options:

• For $12, you get a five-visit punch card with a $5 value per visit (a $25 total value).
• For $25, you get a 12-visit punch card with a $5 value per monthly visit (a $60 value).
  
  

Dessert devotees at N2 Ice Cream Factory chill their creamy concoctions with frigid blasts of liquid nitrogen, a technique culled from molecular gastronomy. Customers traipse along the glass-lined serving station to select either a vanilla or chocolate base, desired toppings and sauces, and a fitting nickname for each concoction. The chipper staff blends all ingredients into a metal bowl and then freezes the mixture in a matter of seconds using gusts of liquid nitrogen that shroud the station in shadowy clouds of mist. Craft a customized small ($3.75), medium ($5), or large ($6.25) sundae from nearly 40 add-ins, including caramel, chocolate chips, and almonds (first topping is free; all additional toppings are $0.50 each), or sample a signature creation such as s’mores and peach cobbler. The creamery also muddles a selection of seasonal flavors, including Santa’s peppermint bark, pumpkin pie, and gingerbread. Patrons can corral the sugary treats in a sturdy cup, waffle bowl ($1.50 extra), waffle cone ($1.50 extra), or between the pages of a favorite cookbook.