I personally don’t think of myself as either an optimist or a pessimist.
Nanotechnology has been moving a little faster than I expected, virtual reality a little slower.
Once a discovery has been published, there is no way of un-publishing it.
For healthy adult people, the really big thing we can foresee are ways of intervening in the ageing process, either by slowing or reversing it.
There are some problems that technology can’t solve.