![](/nationalgeographic/trailblazer_april_2019/more_is_better/247200/igloo.480_0_1.jpg)
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247201/penguin.128_0_1.png)
Aniglooisahousemade oficeor snow.
ApplytheScience
Thesepenguinswanttobuildaniglooontopofthistable.Theyneedtoliftsomeice.Thebucketoficeisprettyheavy.PollyPenguinhasanideaforhowtoliftittoPeterPenguin.She’sgoingtotrytouseapulley....You cantrythis, too!
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247199/iceblocks_intro.240_0_1.png)
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247202/setup_1.1440_0_1.jpg)
Peter
table
chair
Polly
chair
bucketof ice
rope
abroom handle
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247203/setup_2.1440_0_1.jpg)
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247193/iceblocks_1.128_0_1.png)
1
Peterlaysthebroomhandlebetweenthetwochairs.Pollytiesoneendoftheropetotheicebucket.Sheloopstheotherendoftheropearoundthebroomhandle.She’smadeasimplepulley.Shegivestheropeapull,butit’snotenoughtoliftthe bucket.
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247204/setup_3.1440_0_1.jpg)
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247194/iceblocks_2_1.128_0_1.png)
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247195/iceblocks_2_2.128_0_1.png)
2
Peterisstillwaitingfortheice.So,Pollytriesanotherapproach.Thistime,shetiesoneendoftheropetothebroomhandle.Sheloopstheropethroughthehandleoftheicebucketandaroundthebroomhandle.Now,Pollyhasmadeacompoundpulley.She’sabletoliftthebucketallthewaytothe top.
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247205/setup_4.1440_0_1.jpg)
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247197/iceblocks_3_2.128_0_1.png)
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247196/iceblocks_3_1.128_0_1.png)
![](/nationalgeographic/trailblazer_april_2019/more_is_better/247198/iceblocks_3_3.128_0_1.png)
3
Peterhastheice,andthepenguinscancontinuetoworkontheirigloo together.