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Three practical tips

Here are three practical tips based on elementary physics and mechanics which not everyone seems to be aware of. They do make life easier.

1. Cutting the nails on your right hand.

A lot of people seem to think the problem with doing this is that they are right-handed. It isn't; it's caused by the way scissors are made. Left-handed scissors do exist but there is no need to buy a pair. All you have to do is to reverse the scissors so that they point towards you, not away from you. (Thanks to a school friend who pointed this out to me some sixty years ago.)

2. Opening difficult jars.

The problem with most of these is that they have been sealed with a vacuum. So pierce the lid with a sharp object such as knife point to release the vacuum. The lid will then come off easily.

3. Squeaking chalk on blackboards.

I suppose that not many people use blackboards these days, but if you still need to and find that a piece of chalk is squeaking maddeningly, break a small piece off the end. This will alter the vibratory frequency and eliminate the squeak.

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