I have been watching every televised event Biden has participated in during the campaign. As many have pointed out, he looked like someone well into cognitive decline. But I noticed a stark difference in his appearance at the convention, as well as in his interview with ABC. He looks way more energetic and aware, and has almost a "glow" to him. The eyes look less sunken and are bright.
I'm unable to explain what might be responsible for this change. I was wondering if anyone else noticed this, and if so if you have any theories on how this has been achieved.