The Download: testing six tech promises and biotech’s blind spots

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.Are we there yet? A reality check on six big tech promisesSome seemingly impossible feats are too good to give up on. Decoding a pet’s yowls and yips? Absolutely. Scrubbing the world of forever chemicals? Yes, please. Rocketing to Mars in a fraction of the time? Sounds great, but how close are we, really?In the new Impossible issue of MIT Technology Revie