As we approach the end of November I note that the Secret Laboratory has been rather quiet this month (demonstrating to my critics that I have not got too much time on my hands). With time running out, I decided to pull something random out of the hat by addressing the problem of hairs in the bath.
We all know the problem. Whether you're a gent such as myself who finds facial shaving more comfortable following a totally immersive long hot soak, or a lady pursuing the ideal of the silky smooth leg, once you pull that plug you know there is going to be some troublesome debris that just doesn't seem to want to go down the plughole.
The Secret Laboratory has investigated the dynamics of in-bath-shaving-related-debris (IBSRD) and has come up with the following observations and a solution:
As the bath empties, the temptation is to try to sweep the debris towards the plughole. As the wave rushes down the slope of the bath, some debris may disappear down the plughole but most will return with the (now very energetic) wave reflected from the end of the bath and is deposited as the returning wave loses energy on the incline. These are the very same dynamics that are responsible for sand deposition upon beaches.
The solution is to avoid sweeping the water towards the plughole. Instead, with your hand, keep injecting energy into the waters, even in the upper-reaches of the bath, with a constant stirring action, round and round. So long as you keep all of the water moving, it will continue to carry the debris and eventually disappear down the plughole of its own accord. You may find you don't even need to clean the bath afterwards.
I don't know - I really ought to charge for this kind of practical research...