Plus: COP31’s flagship pledge to electrify 35% of energy use is sinking. This is today's edition of The Download, our weekday newsletter that provides a daily dose of what's going on in the world of technology. As we age, we forget most of what we’ve experienced, yet there’s still undeniable continuity: At 30, or 50, or 70, you will still be you. To preserve that elusive continuity of self, some far-thinking technologists are exploring ways to keep the brain going, even beyond death.