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== Rules ==

Revision as of 01:59, 30 October 2013

Welcome to the explain xkcd wiki!
We have an explanation for all 2 xkcd comics, and only 0 (0%) are incomplete. Help us finish them!

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Google Solar Cycle
From Google Trends, it looks like the lag between people Googling cocktail recipes and 'hangover cure' is 14 hours.
Title text: From Google Trends, it looks like the lag between people Googling cocktail recipes and 'hangover cure' is 14 hours.

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: Created by a SOLAR FLARE SEARCHING UP SOLAR FLARES - Please change this comment when editing this page. Do NOT delete this tag too soon.

Solar flares appear on the Sun's surface in different numbers at different times. A solar cycle is the amount of time that elapses between times of maximum (or minimum) solar flare activity. This period is approximately 11 years.

Solar flares can generate interest, and 'news' stories at times of high activity, because they can sometimes cause aurorae, as well as power outages and other similar issues. Hence people will be more aware of them, and search for "solar flares" on Google to learn more about them. This trend somewhat matches the solar cycle since people will be more interested/concerned about solar flares during the times they are abundant and search for them more often. Randall notes that Google has existed for long enough to see the trend in searches for "solar flare" over a full solar cycle.

The title text comments that people usually Google "hangover cure" 14 hours after they search for cocktail recipes. This suggests that people decide they want cocktails, look for ways to make cocktails, make (and presumably drink) the cocktails, wake up with a hangover and look for ways to get rid of the hangover. Google trends does indeed suggest that there is roughly a 14-hour difference in peaks between these searches, however this does not mean (as the title text implies) that the people searching for cocktail recipes are the same people that are searching for hangover cure later. It may represent the (not unreasonable) assumption that people who are exploring the idea of cocktails (for themselves or others) generally start to do so from the early evening onward, whilst those who find themselves freshly under the weather (not just from cocktail consumption) are likely to be finally provoked to look up a solution from around the mid-morning.

One can illustrate the pitfalls of assuming such causation by substituting "chicken nuggets" for "cocktail recipe" which shows a very similar relationship. Chicken nuggets are not known to cause hangovers.[citation needed]

Looked at another way, there is a 10-hour 'lag' from searching for "hangover cure" to searching for "cocktail recipe"; this does not imply that having a hangover is causing people to be interested in drinking cocktails!

Transcript

Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.
In the top left corner of the image, the words Google Trends search traffic for "Solar Flare" are present (the name of the graph.)
[A graph starting in 2005, peaking in 2013. It rises until 2024 when the graph cuts off. There is an arrow in between the two peaks labeled "11 years".]
[Caption below the panel:]
I like that Google has existed almost long enough for us to observe the solar cycle using Google Trends.


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