The sticky note is the most used office stationary on this planet. Isn't it silly that we need all these personal organizers, PDAs, and the like to remember the most mundane of activities? The memo note uses thermo-chromic ink - like that used in thermometer strips - which changes color in response to temperature. It also employs low-cost electronic circuit printing technology, similar to that inside musical and light-up greeting cards. The reusable notes were originally designed for people with severe memory loss, such as Alzheimer's patients, but Girton Labs, which developed the device, says they can be used all around the home and office.

The inventor, Lyndsay Williams, 49, hopes the notes will be on sale next year at £10 for a pack of ten. If only I remember, why I bought these?

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