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What is happening with that glider?

the engine is damaged
it is releasing the water ballast
cabin decompression is ongoing
contrails are formed due to low air temperature
The extra weight provided by the water ballast is advantageous if the lift is likely to be strong, and may also be used to adjust the glider's center of mass. To avoid undue stress on the airframe, gliders must jettison any water ballast before landing.
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Answers by country

the engine is damaged
it is releasing the water ballast
cabin decompression is ongoing
contrails are formed due to low air temperature
answers
flagAustralia
1%
64%
6%
24%
75
flagNew Zealand
0%
64%
5%
23%
17
flagGermany
2%
62%
7%
26%
375
flagUnknown
0%
61%
38%
0%
13
flagGreece
0%
61%
0%
38%
13
flagthe Netherlands
0%
58%
5%
35%
17
flagAustria
3%
57%
15%
23%
59
flagSwitzerland
2%
52%
5%
39%
38
flagthe Philippines
8%
52%
12%
28%
25
flagCanada
0%
51%
5%
41%
39
flagPoland
3%
50%
11%
33%
8122
flagthe United Kingdom
2%
50%
9%
36%
205
flagthe United States
5%
49%
11%
31%
429
flagRepublic of Ireland
3%
48%
0%
44%
27
flagMalaysia
5%
47%
0%
47%
19
flagSpain
6%
43%
0%
50%
16
flagSouth Africa
10%
42%
5%
36%
19
flagIndia
16%
39%
13%
29%
193
flagSingapore
5%
33%
11%
44%
18
flagNigeria
7%
23%
23%
38%
13

Does the candle burn more or less violently in zero gravity?

more violently
about the same
less violently
nobody knows

Which area is brighter?

A
B
Both are the same
It depends on the order of seeing

How many dots at the intersections are black?

10%
25%
50%
None

Why are gliders almost always painted white?

to easily hide in clouds
to reduce solar heating
to make gliders distinguishable from other aircraft
to allow quick replacement of damaged parts