the cover story is breakthrough technologies in 2014 and editors brian bergstein joins us for today's discussion. brian bergstein howdy defined breakthrough technology is your group together this package were m.i.t. technology review? >> guest: what we try to do a separate incremental development from something that is more of a milestone. how do you define a milestone in? we ask ourselves which technological breakthroughs over the past year are going to solve a big problem or a set of problems? they don't necessarily solve a problem. they somehow reduce the friction in the world where they create new opportunities, business opportunities perhaps are even new opportunities to use technology further. so they're somehow a foundational and set the stage for future developments. >> host: running to the list of 10 breakthrough technologies for our viewers and we'll delve into these as we go through this segment. of the 10 magazine came up with genome editing agile robots alter climate smartphones microscale 3-d printing which uses new types of materials like living cells in 3-d printing, m

breakthrough technologies of 2014 but it want to bring in callers as we discussed this issue with brian bergstein of m.i.t. technology review. let's go to roger waiting in naperville illinois on our line for independents. roger, good morning. roger are you with us? roger mika stepped away. we will will go door independent line, nick is waiting in oakland california. good morning. >> caller: hi. i was noticing in technologies you mentioned wind and solar. i've been puzzled for some time why tidal energy hasn't been exploited. it's available and most of the people in the united states live within 25 miles of the coast. it's an obvious of energy and easy to use. >> guest: it's a great question. the answer is unfortunately like in a promising sounding alternative energy that has to be economical and tidal energy is useful and could be promising but it's not yet economical. it's just not going to generate enough power to be worth installing the installations and doing what you need to do to harness the power. that's actually what's interesting about this item on our list about smart wind and solar pow