A blackhouse is a traditional house in some parts of Scotland, with drystone walls and a turf roof.

Drystone walling can be done by minors. But, as some of the stones may be big and heavy, it is best to let them only handle the small stones. As drystone walling is a skill, a minor (working with an expert) will gain a skill that they may use once they grow into an adult.

he has 1 arm

On 31 December 1984, drummer Rick Allen lost his left arm in a car crash driving in the hills outside Sheffield when his Corvette swerved off the road on a sharp bend and went through a drystone wall.

He continued as a drummer for the band with a specially modified drum kit, whereby his feet do the drumming of his missing left arm.

Most Hard Disks these days are in sealed containers. Most people judge how fast or how slow a hard disk is by how fast it will do certain things. The technical people can talk about wetstone tests, drystone tests, slighly damp rock tests, but, if you can save a 20 page word document in 10 seconds on you old machine and 2 seconds on a new machine then what is the RPM of both

For all the tech experts talk of whetstone tests, drystone test, slightly damp rock tests, etc.

The real test to run to deturmine how fast a computer is to create a spreadsheet with 1 000 rows and 1 000 columns and fill it with random numbers. Then tell the program to sum each row and colum, but, not yet. the computer that fininishes all the calculations is best in computing speed.