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there was travesty and loss of life, and all these terrible things that happened because of it — but ultimately, it did enable a lot of progress for all of people that i think arose from discovering and realising the opportunities in the new world. so, i'm not going to rush to judgment to say that someone choosing to invest their wealth in discovering new frontiers — whether that's microscopic biological frontiers, or whether that's space frontiers — is doing right or wrong. i think time will tell what the benefits will be that will accrue ultimately to all people, if those discoveries do pan out, and they do yield benefit for us. dave friedberg, we have to end there, but thanks very much forjoining me on hardtalk. thanks for having me.