As we pointed out earlier, we've long been able to restore hearing to the deaf, but restoring sight to the blind is a much more complicated matter. When people lose their sight, their retinas no longer send signals from their photoreceptors to their brains. To make an artificial eye, we'd need to understand how the retina processes those signals, and that's a code scientists just haven't been able to crack.
As a result, his position on the Forbes' ranking dropped 220 spots, leaving him tied with 19 others as the 544th richest person in the world.
You may already use Google Calendar, but are you using it wisely? Here’s a secret: only put stuff on your Google Calendar that will actually happen at that date and time. Use iPhone Reminders to remember things that are not time-sensitive (down to the hour or minute). Following this strategy will help you stay more sane.