Can you solve the unstoppable blob riddle? - Dan Finkel

8,275,724 views ใƒป 2019-03-18

TED-Ed


์•„๋ž˜ ์˜๋ฌธ์ž๋ง‰์„ ๋”๋ธ”ํด๋ฆญํ•˜์‹œ๋ฉด ์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค.

๋ฒˆ์—ญ: Young Ju Jeong ๊ฒ€ํ† : Dahyun Ha
00:07
A shooting star crashes on Earth,
0
7789
2450
์œ ์„ฑ์ด ์ง€๊ตฌ์™€ ์ถฉ๋Œํ–ˆ์Šต๋‹ˆ๋‹ค.
00:10
and a hideous blob emerges.
1
10239
2900
๊ทธ๋ฆฌ๊ณ  ๋–จ์–ด์ง„ ์ž๋ฆฌ์—์„œ ๋”์ฐํ•œ ๊ดด๋ฌผ์ด ๋‚˜ํƒ€๋‚ฌ์Šต๋‹ˆ๋‹ค.
00:13
It creeps and leaps, it glides and slides.
2
13139
3886
๊ดด๋ฌผ์€ ๋‚ ๋›ฐ๋ฉฐ ์˜จ๊ฐ– ๊ณณ์„ ํ—ค์ง‘๊ณ  ๋‹ค๋…”๊ณ 
00:17
Itโ€™s also unstoppable:
3
17025
2160
๋ง‰๋Š” ๊ฒƒ ์—ญ์‹œ ๋ถˆ๊ฐ€๋Šฅ ํ–ˆ์Šต๋‹ˆ๋‹ค.
00:19
weapons, fire, extreme temperaturesโ€ฆ
4
19185
2460
๋ฌด๊ธฐ, ๋ถˆ, ๊ทนํ•œ์˜ ์˜จ๋„...
00:21
no matter what you throw at it,
5
21645
1740
๋ฌด์Šจ ์ˆ˜๋ฅผ ์จ๋„,
00:23
it just regrows and continues its rampage.
6
23385
3890
๊ดด๋ฌผ์€ ๋‹ค์‹œ ์ž๋ผ๋‚˜์„œ ๋‚ ๋›ฐ๊ธฐ๋ฅผ ๋ฐ˜๋ณตํ•ฉ๋‹ˆ๋‹ค.
00:27
Its expansion is breathtaking;
7
27275
2200
๊ทธ ์„ฑ์žฅ ์†๋„๋Š” ์–ด๋งˆ๋ฌด์‹œํ•ด์„œ
00:29
it doubles in size every hour.
8
29475
2660
๋งค ์‹œ๊ฐ„๋งˆ๋‹ค ํฌ๊ธฐ๊ฐ€ ๋‘๋ฐฐ๋กœ ๋ถˆ์–ด๋‚ฉ๋‹ˆ๋‹ค.
00:32
But thereโ€™s one opportunity:
9
32135
2080
ํ•˜์ง€๋งŒ ํ•œ ๊ฐ€์ง€ ๋ฐฉ๋ฒ•์ด ์žˆ์Šต๋‹ˆ๋‹ค.
00:34
after each hour, it goes to sleep,
10
34215
2920
๊ดด๋ฌผ์€ ํ•œ ์‹œ๊ฐ„๋งˆ๋‹ค ์ž ์— ๋“ค์–ด
00:37
forming itself into a flat triangle
11
37135
2500
๋‚ฉ์ž‘ํ•œ ์‚ผ๊ฐํ˜•์˜ ๋ชจ์–‘์œผ๋กœ ๋ณ€ํ•ด
00:39
and resting for a few minutes
12
39635
2070
๋‹ค์‹œ ๋จน๊ณ  ์„ฑ์žฅํ•˜๊ธฐ๋ฅผ ๋ฐ˜๋ณตํ•˜๊ธฐ ์ „์—
00:41
before it begins eating and growing again.
13
41705
3710
๋ช‡๋ถ„๊ฐ„ ํœด์‹์„ ์ทจํ•ฉ๋‹ˆ๋‹ค.
00:45
Your only chance to save the planet
14
45415
2000
๋‹น์‹ ์ด ์ง€๊ตฌ๋ฅผ ๊ตฌํ•  ์œ ์ผํ•œ ๋ฐฉ๋ฒ•์€
00:47
involves a satellite-mounted nano-fission ray that can cut through the blob.
15
47415
5980
๊ดด๋ฌผ์„ ๊ฐ€๋ฅด๋Š” ๋‚˜๋…ธ๋ถ„์—ด ๊ด‘์„ ์ด ํƒ‘์žฌ๋œ ์ธ๊ณต์œ„์„ฑ์„ ์ด์šฉํ•˜๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.
00:53
When the blog is active
16
53395
1476
๊ดด๋ฌผ์ด ํ™œ๋™์ ์ผ ๋•
00:54
it heals itself within seconds.
17
54871
2230
์ˆ˜ ์ดˆ ์ด๋‚ด๋กœ ํšŒ๋ณตํ•ฉ๋‹ˆ๋‹ค.
00:57
However, when you break the sleeping blob into two triangles,
18
57101
3780
ํ•˜์ง€๋งŒ, ๊ดด๋ฌผ์ด ์ž๊ณ  ์žˆ๋Š” ๋™์•ˆ ๊ดด๋ฌผ์„ ๋‘๊ฐœ์˜ ์‚ผ๊ฐํ˜•์œผ๋กœ ์ž๋ฅด๋ฉด
01:00
you make a critical discovery.
19
60881
2130
๋†€๋ผ์šด ๊ฒƒ์„ ๋ณด๊ฒŒ ๋  ๊ฒƒ ์ž…๋‹ˆ๋‹ค.
01:03
The acute triangle portion,
20
63011
2410
์ž˜๋ผ๋‚ธ ์‚ผ๊ฐํ˜•์˜ ๋ชจ๋“  ๊ฐ์ด
01:05
with all angles less than 90 degrees, is inert.
21
65421
4330
90๋„๋ณด๋‹ค ์ž‘์€ ์˜ˆ๊ฐ ์‚ผ๊ฐํ˜•์ด๋ฉด
01:09
It never โ€œwakes up.โ€
22
69751
1838
๋” ์ด์ƒ ํ™œ๋™์„ ํ•˜์ง€ ์•Š์Šต๋‹ˆ๋‹ค.
01:11
The obtuse triangle,
23
71589
1370
์ž˜๋ผ๋‚ธ ์‚ผ๊ฐํ˜•์˜ ํ•œ ๊ฐ์ด 90๋„ ์ด์ƒ์ธ ๋‘”๊ฐ์‚ผ๊ฐํ˜•์ด๋ฉด,
01:12
which has an angle greater than 90 degrees,
24
72959
2580
01:15
wakes up as usual and keeps growing.
25
75539
2680
์‚ผ๊ฐํ˜•์€ ๋‹ค์‹œ ๊นจ์–ด๋‚˜ ํ™œ๋™์„ ๊ณ„์†ํ•ฉ๋‹ˆ๋‹ค.
01:18
Similar experiments show that all shapes other than acute triangles,
26
78219
4300
์—ฌ๋Ÿฌ ์‹คํ—˜์„ ํ†ตํ•ด ์•Œ์•„๋‚ธ ์‚ฌ์‹ค๋กœ๋Š” ์ง๊ฐ ์‚ผ๊ฐํ˜•์„ ํฌํ•จํ•ด์„œ
01:22
including right triangles, will also wake up.
27
82519
3617
์˜ˆ๊ฐ ์‚ผ๊ฐํ˜•์ด ์•„๋‹Œ ๋ชจ๋“  ๋„ํ˜•์€ ๋‹ค์‹œ ๊นจ์–ด๋‚ฉ๋‹ˆ๋‹ค.
01:26
For the next few minutes,
28
86136
1370
์ด์ œ ๋ช‡ ๋ถ„ ํ›„๋ฉด
01:27
the blob is sleeping in its obtuse triangle form.
29
87506
3960
๊ดด๋ฌผ์€ ๋‘”๊ฐ์‚ผ๊ฐํ˜•์œผ๋กœ ๋ณ€ํ•ด ์ž ์„ ์ž˜ ๊ฒƒ์ž…๋‹ˆ๋‹ค.
01:31
You can make clean, straight-line cuts
30
91466
2660
๋‹น์‹ ์€ ์‚ผ๊ฐํ˜•์˜ ๋‘ ์ง€์ ์„ ์–ด๋Š ๊ณณ์ด๋“  ์ •ํ•ด
01:34
between any two points on or inside the triangle.
31
94126
3570
๋ง๋”ํ•œ ์ง์„ ์œผ๋กœ ์ž๋ฅผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
01:37
But youโ€™ll only have time to make 7 cuts while the satellite is above you.
32
97696
4660
ํ•˜์ง€๋งŒ ์ธ๊ณต์œ„์„ฑ์ด ์œ„๋ฅผ ์ง€๋‚˜๊ฐ€๋Š” ๋™์•ˆ ๊ดด๋ฌผ์„ ์ž๋ฅผ ๊ธฐํšŒ๋Š” 7๋ฒˆ๋ฐ–์— ์—†์œผ๋ฉฐ
01:42
By the time it completes its orbit and returns,
33
102356
2910
์œ„์„ฑ์ด ๊ถค๋„๋ฅผ ๋Œ๊ณ  ๋‹ค์‹œ ๋Œ์•„์˜ฌ ๋•Œ ์ฏค์ด๋ฉด
01:45
the blob will have consumed the entire world,
34
105266
2950
๊ดด๋ฌผ์ด ์ด๋ฏธ ์ง€๊ตฌ๋ฅผ ๋ฎ์–ด๋ฒ„๋ ธ์„ ๊ฒƒ์ž…๋‹ˆ๋‹ค.
01:48
if even a single portion that will wake up remains.
35
108216
4540
๊นจ์–ด๋‚  ์ˆ˜ ์žˆ๋Š” ์‚ผ๊ฐํ˜•์ด ๋‹จ ํ•˜๋‚˜๋ผ๋„ ๋‚จ์•˜๋‹ค๋ฉด ๋ง์ด์ฃ .
01:52
How can you cut the blob entirely into acute triangles
36
112756
3698
์–ด๋–ป๊ฒŒ ํ•˜๋ฉด ๋‹น์‹ ์€ ๊ดด๋ฌผ์„ ์™„์ „ํžˆ ์˜ˆ๊ฐ์‚ผ๊ฐํ˜•์œผ๋กœ ์ž˜๋ผ
01:56
and stop it from destroying the planet?
37
116454
2630
์ง€๊ตฌ๋ฅผ ๋ฉธ๋ง์‹œํ‚ค๋Š” ๊ฒƒ์„ ๋ง‰์„ ์ˆ˜ ์žˆ์„๊นŒ์š”?
01:59
Pause the video now to figure out for yourself
38
119084
2190
์ง€๊ธˆ ์˜์ƒ์„ ๋ฉˆ์ถ”๊ณ  ํ•œ ๋ฒˆ ์ƒ๊ฐํ•ด๋ณด์„ธ์š”.
02:01
Answer in 3
39
121274
1333
[3์ดˆ ํ›„์— ๋‹ต ๊ณต๊ฐœ]
02:02
Answer in 2
40
122607
2700
[2์ดˆ ํ›„์— ๋‹ต ๊ณต๊ฐœ]
02:05
Answer in 1
41
125307
2160
[1์ดˆ ํ›„์— ๋‹ต ๊ณต๊ฐœ]
02:07
While this seems doable at first,
42
127467
2128
์ฒ˜์Œ์—” ์–ด๋ ต์ง€ ์•Š์•„ ๋ณด์ด๊ฒ ์ง€๋งŒ
02:09
thereโ€™s a hidden difficulty when it comes to avoiding obtuse and right angles.
43
129595
4910
๋‘”๊ฐ์‚ผ๊ฐํ˜•๊ณผ ์ง๊ฐ์‚ผ๊ฐํ˜•์ด ๋˜๋Š” ๊ฒƒ์„ ํ”ผํ•˜๋ ค ํ•  ๋•Œ ๋ฌธ์ œ๊ฐ€ ์ƒ๊น๋‹ˆ๋‹ค.
02:14
Every time you make a cut that reaches an edge,
44
134505
3320
๊ฐ€์žฅ์ž๋ฆฌ๊นŒ์ง€ ์‚ผ๊ฐํ˜•์„ ์ž๋ฅด๋ฉด
02:17
it either makes an acute and an obtuse angle, or two right angles.
45
137825
4960
์˜ˆ๊ฐ์‚ผ๊ฐํ˜•๊ณผ ๋‘”๊ฐ์‚ผ๊ฐํ˜•, ๋˜๋Š” ๋‘ ๊ฐœ์˜ ์ง๊ฐ์‚ผ๊ฐํ˜•์ด ๋ฉ๋‹ˆ๋‹ค.
02:22
That makes it seems like youโ€™re doomed to keep creating obtuse angles.
46
142785
4890
๋‘”๊ฐ์‚ผ๊ฐํ˜•์€ ์ ˆ๋Œ€ ์‚ฌ๋ผ์ง€์ง€ ์•Š์„ ๊ฒƒ ๊ฐ™์•„ ๋ณด์ด์ฃ .
02:27
But as with so many of lifeโ€™s problems,
47
147675
2680
ํ•˜์ง€๋งŒ ์ธ์ƒ์˜ ๋‹ค๋ฅธ ๋ฌธ์ œ๊ฐ€ ๊ทธ๋Ÿฌ๋“ฏ์ด
02:30
we can look to pizza for inspiration.
48
150355
3130
์šฐ๋ฆฌ๋Š” ํ”ผ์ž์—์„œ ๊ทธ ํ•ด๋‹ต์„ ์ฐพ์•„๋‚ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
02:33
Imagine squaring off the outside of a pizza,
49
153485
3350
ํ”ผ์ž์˜ ๊ฒ‰ ๋ถ€๋ถ„์„ ๊ฐ์ด ์ง€๋„๋ก ์ž˜๋ผ๋‚ธ๋‹ค๊ณ  ์ƒ๊ฐํ•ด๋ณด์„ธ์š”.
02:36
so that instead of a circle, itโ€™s an octagon.
50
156835
3140
ํ”ผ์ž๋Š” ์›์ด ์•„๋‹Œ, ํŒ”๊ฐํ˜•์ด ๋ฉ๋‹ˆ๋‹ค.
02:39
When we cut it into slices,
51
159975
1830
์ด๊ฒƒ์„ ์กฐ๊ฐ๋‚ด๋ฉด
02:41
each of the eight triangles is acute.
52
161805
2540
8๊ฐœ์˜ ์‚ผ๊ฐํ˜•์€ ๋ชจ๋‘ ์˜ˆ๊ฐ์‚ผ๊ฐํ˜•์ด ๋ฉ๋‹ˆ๋‹ค.
02:44
This works with larger polygons too.
53
164345
2350
์ด ์‚ฌ์‹ค์€ ๋ณ€์ด ๋” ๋งŽ์€ ๋‹ค๊ฐํ˜•์—์„œ๋„ ํ†ตํ•ฉ๋‹ˆ๋‹ค.
02:46
Importantly, it also works for some polygons with fewer sides,
54
166695
4960
์—ฌ๊ธฐ์„œ ์ค‘์š”ํ•œ ๊ฒƒ์€ ์ด๊ฒƒ์ด ๋ณ€์ด ๋” ์ ์€ ๋‹ค๊ฐํ˜•์—๋„ ์ ์šฉ๋˜์–ด
02:51
including heptagons, hexagons, and pentagons.
55
171655
4130
์น ๊ฐํ˜•, ์œก๊ฐํ˜•, ์˜ค๊ฐํ˜•๋„ ๋งˆ์ฐฌ๊ฐ€์ง€๋กœ ์ž๋ฅผ ์ˆ˜ ์žˆ๋‹ค๋Š” ๊ฒƒ์ด์ง€์š”.
02:55
Thatโ€™s good news,
56
175785
1007
๊ทธ๊ฑฐ ์ฐธ ์ข‹์€ ์†Œ์‹์ด๋„ค์š”.
02:56
because if you cut off the sharp corners of the blob triangle,
57
176792
3950
์™œ๋ƒํ•˜๋ฉด ์‚ผ๊ฐํ˜• ๊ดด๋ฌผ์˜ ๋พฐ์กฑํ•œ ๋์„ ์ž˜๋ผ๋‚ด๋ฉด,
03:00
a pentagon is exactly what youโ€™ll be left with.
58
180742
3650
๋‚จ์€ ๋ถ€๋ถ„์€ ์˜ค๊ฐํ˜•์ด ๋˜๊ธฐ ๋•Œ๋ฌธ์ž…๋‹ˆ๋‹ค.
03:04
And just like a pizza,
59
184392
1840
๊ทธ๋ฆฌ๊ณ  ํ”ผ์ž์ฒ˜๋Ÿผ,
03:06
you can cut the blob pentagon into five acute triangles.
60
186232
4550
๊ทธ ์˜ค๊ฐํ˜•์„ ๋‹ค์„ฏ๊ฐœ์˜ ์˜ˆ๊ฐ์‚ผ๊ฐํ˜•์œผ๋กœ ์ž๋ฅด๊ธฐ๋งŒ ํ•˜๋ฉด ๋ฉ๋‹ˆ๋‹ค.
03:10
Thatโ€™s 7 cuts, and it renders the blob completely inert.
61
190782
5026
๊ด‘์„ ์„ 7๋ฒˆ ์‚ฌ์šฉํ•ด์„œ ๊ดด๋ฌผ์„ ์™„์ „ํžˆ ๋ฉˆ์ท„์Šต๋‹ˆ๋‹ค.
03:15
Youโ€™ve saved the day!
62
195808
1500
๋‹น์‹ ์ด ์ง€๊ตฌ๋ฅผ ๊ตฌํ–ˆ์–ด์š”!
03:17
Now you just need to figure out what to do
63
197318
2000
์ด์ œ ๋‹น์‹ ์€ ์ด ํŒŒ๊ดดํ•  ์ˆ˜ ์—†๋Š” ๊ฑฐ๋Œ€ํ•œ ์‚ผ๊ฐํ˜•์„
03:19
with all of these giant, practically indestructible triangles.
64
199318
3630
์–ด๋–ป๊ฒŒ ํ•ด์•ผํ• ์ง€ ์ƒ๊ฐํ•ด๋‚ด๊ธฐ๋งŒ ํ•˜๋ฉด ๋ฉ๋‹ˆ๋‹ค.
์ด ์›น์‚ฌ์ดํŠธ ์ •๋ณด

์ด ์‚ฌ์ดํŠธ๋Š” ์˜์–ด ํ•™์Šต์— ์œ ์šฉํ•œ YouTube ๋™์˜์ƒ์„ ์†Œ๊ฐœํ•ฉ๋‹ˆ๋‹ค. ์ „ ์„ธ๊ณ„ ์ตœ๊ณ ์˜ ์„ ์ƒ๋‹˜๋“ค์ด ๊ฐ€๋ฅด์น˜๋Š” ์˜์–ด ์ˆ˜์—…์„ ๋ณด๊ฒŒ ๋  ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๊ฐ ๋™์˜์ƒ ํŽ˜์ด์ง€์— ํ‘œ์‹œ๋˜๋Š” ์˜์–ด ์ž๋ง‰์„ ๋”๋ธ” ํด๋ฆญํ•˜๋ฉด ๊ทธ๊ณณ์—์„œ ๋™์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค. ๋น„๋””์˜ค ์žฌ์ƒ์— ๋งž์ถฐ ์ž๋ง‰์ด ์Šคํฌ๋กค๋ฉ๋‹ˆ๋‹ค. ์˜๊ฒฌ์ด๋‚˜ ์š”์ฒญ์ด ์žˆ๋Š” ๊ฒฝ์šฐ ์ด ๋ฌธ์˜ ์–‘์‹์„ ์‚ฌ์šฉํ•˜์—ฌ ๋ฌธ์˜ํ•˜์‹ญ์‹œ์˜ค.

https://forms.gle/WvT1wiN1qDtmnspy7