So, why is that metric knobs are becoming popular in the USA where the metric system has STILL not taken hold? Well, with us bringing in the falcon menace scopes with metric knobs in the sniper store I thought I would offer my thoughts about this latest trend.

Scientists at the National Physical Laboratory (NPL) have released new research results that could affect how we measure a kilogram — the last SI unit based on a manufactured object. The International System of Units (SI) is the foundation for all our measurements from the beer in your pint to the gap between the tick and the tock on your clock.

SI units are defined by the General Conference on Weights and Measures. The next meeting of the conference, in November 2007, will consider a range of issues related to the maintenance of the SI, including an initial proposal to prepare for the redefinition of several of the base units.

A mnemonic (pronounced [nəˈmɒnɪk] in RP, [nɪ'mɑnɪk] in GA) is a memory aid that generally serves an educational purpose. They are mostly verbal, e.g a word, each of whose letters help the user to remember the first letters of items in a list. However, there are also other types of mnemonics, such as visual mnemonics. Mnemonics rely on associations between something that is easy to remember, and something that is harder to remember. Sometimes mnemonics are chosen to directly relate to the target information, and othertimes they are arbitrary.