Things are starting to get seasonally cold, so how about some penguin hand warmers? If you are unfamiliar with them, they're basically plastic bags filled with gel. Inside the gel there's metal plate, twisting off chauses a chemical reaction. This heats the plate and in turn the gel, making the whole thing warm for about an hour. They are also reusable, just keep them in a boiling water to recharge.

These ones are from Delta Sport and change colour when in use. If you've ever seen image-changing coffee cups, it's the same effect.

By the way, as weird as penguin themed 'warmers' may seem, they are apparently a well-used combination. In fact, this is the third one featured so far – in addition to the recent hot water bag.

Oh, on the topic of penguins featured, next week we'll have a big one. Literally. In more ways than one.