I saw this story on local TV. They show rats in a circular pool. First they are disoriented, but the one with gene therapy can remember where it entered the pool filled with an opaque liquid to obscure the steps.
They can return to find the steps from whence they came. They found exactly which gene to tamper with, to repair.
Trust me, it was unfriggen' believable. WCCO.com might still have the story in its health section.
Someone should show this story to Nancy Reagan- it would bring tears to her eyes. It was that amazing. Alzhiemers will be cured within 6-8 years.
If so, then the Medicare problem will be majorly resolved. Find a cure or treatment for Alzheimer's, diabetes and arthritis, and the budget will be fine into the far future. The Nursing Home industry will be out of business however.