How to spend $US1 billion

I resort to pedantry in order to avoid or stall a direct answer to this albeit common question, which I, along with many, must have mulled over many a time. I note the direct USA reference and how I am not sure now which countries use the short scale (10 to the power of 9 ie 1,000,000,000) or the long scale (10 to the power of 12 ie 1,000,000,000,000). It makes quite a big difference, thus discombobulating thoughts on how such a large sum might be distributed.

I would find it such a headache that, whether short or long, I would employ some trusted administrator to set the moolah up as a philanthropic trust for health and education where most needed.