The first 'reaction' that we tried for our hand warmer involved dissolving potassium carbonate (K 2 CO 3) in water. Potassium carbonate is one of the chemicals left behind in the ashes of burnt wood.

Hand warmers come in different varieties ... Tip: If using plaid flannel, follow the lines in the pattern for even cuts.

Hand warmers are lifesavers on the frostiest days of winter. They’re especially essential for those in the most frigid states, such as North Dakota, Minnesota, and, of course, Alaska ...

Somehow, all that typing and mousing does little to warm things up. What you need are hand warmers, obviously, and they might as well be smart and made to fit your hands. Fifteen-year-old ...