Do you ever have a day when you achieve nothing creative and when not one of your writing projects have progressed by so much as a sentence. I have been sitting in front of the computer for several hours - off and on - but my brain has failed to generate any usable content.
Part of the reason is that I am so annoyed with a professional astronomer who picked my brains over a variable star I discovered some time back. His subsequent article doesn't include the previously agreed wording in the acknowledgements section with regard to my, now deceased, co-discoverer. Clearly my brain cannot multi-task.