Explain xkcd: It's 'cause you're dumb.
All matter in the universe was created through nuclear fusion of hydrogen atoms over billions of years. A well written, detailed explanation of this process is available here. In many countries, food products must have their ingredients displayed somewhere on their packaging. Because all matter was originally created through stellar nuclear fusion from hydrogen over time, the ingredients of any item (food or otherwise) can technically be described fully as only being made from hydrogen and time.
The title text is a pun on the words thyme (a herb) and time, as the two words are homophones. Also, the H is the chemical symbol for hydrogen. Of course, the word "thyme" can also be made by adding the letter "h" to the letters "tyme".
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- Hydrogen, Time
I think Randall may be going for another pun with the title text, as "H" is the chemical symbol for hydrogen.--Dangerkeith3000 (talk) 15:42, 19 October 2012 (UTC)
I suspect that without Helium and a little Lithium we wouldn't even be here discussing this. These were both formed independently of Hydrogen shortly after the BB and without them the first stars would have been huge and short-lived...126.96.36.199 14:34, 19 October 2012 (UTC)
- ... in other words, with the addition of time... -- IronyChef (talk) 13:44, 20 October 2012 (UTC)
But you can make matter using energy, therefore, you only need energy and time! Ray
The label's missing energy. Just saying. Davidy22 (talk) 04:34, 19 October 2012 (UTC)
- But isn't it somehow contained in the hydrogen? I don't know squat about quantum physics, so I'm probably wrong. 188.8.131.52 04:49, 19 October 2012 (UTC)
- Actually, the amount of energy in any grocery or non-grocery (even in explosives) is significally lower that the amount of energy in hydrogen used for their creation. Sure, you need energy to grow crops, but where does that energy come from? Hydrogen fusion in Sun - which is first step of creating the carbon the crop is from (not the same crop, of course). -- Hkmaly (talk) 09:12, 19 October 2012 (UTC)
So when Mussolini made the trains run on thyme he was really making them run on hydrogen and time?--Pmakholm (talk) 08:18, 19 October 2012 (UTC)
I think this is the smallest xkcd comic ever. :-)
--184.108.40.206 09:43, 19 October 2012 (UTC)
It's also the first in a long time to make me laugh out loud! Steve B.
I suspect Randall was influenced by this quote: "Given enough time, hydrogen starts to wonder where it came from, and where it is going", attributed to Edward R. Harrison. --Prooffreader (talk) 10:58, 19 October 2012 (UTC)
Actually, I'm not sure you can make antimatter with just regular hydrogen.
--220.127.116.11 11:24, 19 October 2012 (UTC)
- Why would food contain antimatter? --Kronf (talk) 12:21, 19 October 2012 (UTC)
I think I've spotted my first Randall mistake. Using this ingredient list, The amount of time must exceed the amount of hydrogen (unless the product is hydrogen) thus Time should be listed first on the label. — Comment by 14:09, 19 October 2012 (talk) Anthingy (please sign your comments)
- Which units are you using? How do you relate a cup full of Time and a day full of Hydrogen? 18.104.22.168 18:20, 19 October 2012 (UTC)
- In Norway (and I guess most other countries where producers must list them) ingredients are sorted by weight, and I guess time doesn't weigh anything but in a metaphorical sense. --Buggz (talk) 08:39, 22 October 2012 (UTC)
- Even if time weighs nothing, isn't Hydrogen lighter than air at 1 atmosphere? That would give it a negative weight, so it should be listed last.22.214.171.124 04:05, 18 November 2012 (UTC)
- There's a significant difference between having negative weight and being positively buoyant in Earth atmosphere. Weight is simply the acceleration caused by gravity (9.8 m/s^2, here on Earth) multiplied by mass (.0899 g for each litre of hydrogen). Hydrogen has mass (and therefore weight); time doesn't. --LiteralPhilosopher 126.96.36.199 11:45, 26 November 2012 (CST)
- Time has a whole lot of wait. 188.8.131.52 (talk) (please sign your comments with ~~~~)
Yes, that may be a mistake, but the FDA website mentions "predominance by weight." I'm not sure how time would compare to hydrogen in that respect. Also I translated thyme = H+time = tHime. --184.108.40.206 14:25, 19 October 2012 (UTC)
- Also, it's not Randall's first mistake, he made some in the last comic. ??? 14:31, 19 October 2012 (UTC)
- Implying the above commentor is Randall. 220.127.116.11 15:15, 19 October 2012 (UTC)
Time is not a proper ingredient like hydrogen. It is permitted in Randall's ingredient list by cartoon license.
"Because all matter was originally created through stellar nuclear fusion from hydrogen over time"
Nuclear fusion only explains the creation of all elements up to iron. Heavier elements are created by other processes:
- The fusion of heavier elements is still fusion, even if it takes a supernova to make it happen. Nothing in the cartoon suggests that only the fusion reactions found in stable stars apply, and even more complicated processes (fusion+fission, whatever) involves matter that ultimately has a hydrogen pedigree. (I am, however, intrigued by the comment about helium and lithium in the early universe. I have some of those around here somewhere.) 18.104.22.168 21:02, 19 October 2012 (UTC)
At the risk of nitpicking: The present composition of the universe is about 75% dark energy, 20% dark matter, and 5% baryons, i. e., hydrogen, helium, and everything else. In the early universe, the dark energy was less important. And in the very early universe, before the formation of elements or even subnuclear particles, there were just quantum fluctuations of some primordial field. Space, time, and energy are related by gravity. So maybe, if quantum gravity is ever figured out, it will turn out all you need is a fluctuation in time. But all this spoils the herbal pun.
--22.214.171.124 21:29, 19 October 2012 (UTC)
 Universe / Universal
I also think universal is the adjective for universe.
So the label has universal use and specifies universal origin.
--126.96.36.199 23:08, 19 October 2012 (UTC)
This label has now been applied to every poster of the cosmos in my current school. This applies to both the poster as an item and the subject matter of the image. DruidDriver
) 22:22, 22 January 2013 (UTC)