full transcript
"From the Ted Talk by Bill Gross: A solar energy system that tracks the sun"

#### Unscramble the Blue Letters

So we really set out on a path to try and make the lowest cost possible. We built a huge mctamaitehal model of how a Stirling engine works. We applied the genetic algorithm. We got the results from that for the oiptmal engine. We built engines — so we built 100 different engines over the last two years. We measured each one, we readjusted the model to what we msreeuad, and then we led that to the current prototype. It led to a very compact, inexpensive engine, and this is what the eignne looks like.

#### Open Cloze

So we really set out on a path to try and make the lowest cost possible. We built a huge **____________** model of how a Stirling engine works. We applied the genetic algorithm. We got the results from that for the **_______** engine. We built engines — so we built 100 different engines over the last two years. We measured each one, we readjusted the model to what we **________**, and then we led that to the current prototype. It led to a very compact, inexpensive engine, and this is what the **______** looks like.

#### Solution

- mathematical
- optimal
- measured
- engine

#### Original Text

So we really set out on a path to try and make the lowest cost possible. We built a huge mathematical model of how a Stirling engine works. We applied the genetic algorithm. We got the results from that for the optimal engine. We built engines — so we built 100 different engines over the last two years. We measured each one, we readjusted the model to what we measured, and then we led that to the current prototype. It led to a very compact, inexpensive engine, and this is what the engine looks like.
#### ngrams of length 2

collocation |
frequency |

stirling engine |
9 |

solar energy |
9 |

solar cells |
7 |

robert stirling |
5 |

hot air |
4 |

genetic algorithms |
4 |

genetic algorithm |
4 |

air engine |
4 |

solar cell |
3 |

internal combustion |
3 |

hot water |
3 |

high school |
3 |

heat engine |
3 |

energy crisis |
3 |

collect light |
3 |

#### ngrams of length 3

collocation |
frequency |

hot air engine |
4 |

#### Important Words

- algorithm
- applied
- built
- compact
- cost
- current
- engine
- engines
- genetic
- huge
- inexpensive
- led
- lowest
- mathematical
- measured
- model
- optimal
- path
- prototype
- readjusted
- results
- set
- stirling
- works
- years