Wave goodbye to frigid digits

Winter walks are made more comfortable with a hand warmer. Types of hand warmer include:

  • electric rechargeable
  • sealed pouches
  • charcoal
  • air activated
  • catalytic

The sealed pouches contain a supersaturated solution which crystallizes, producing an exothermic reaction, when a metal disc floating inside is clicked. After use, they can be reactivated by placing them in boiling water for about 20 minutes. They do warm up quite nicely, and the process of crystallization is interesting to watch. However, the heat lasts only about 20 minutes, and the reactivation process is a bit inconvenient.

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