Cody looks 10 years younger using one trick It’s mercury. The trick is mercury

A+ for being a true scientist by admitting a flaw in the experiment and evaluating, constraining, and delaying possible conclusions until that flaw can be rectified.

"The cat decided to give the experiment a taste test" Yep, definitely Cody's cat!

Damn Cody, you manage to make things like "watching the grass grow" more interesting than 90% of whole KZfaq...

Holy scientific process, Cody! Lesser youtubers would've looked at the grass length and simply declared "it does", but he took the opportunity to try and debunk his own hypothesis. Deep respect for this man.

Cody is the kind of guy who can make watching grass grow legitimately interesting. What a soft-spoken mad lad.

As a Botanist (final year PhD) I think you've done an amazing sound experiment here and you've outlined how to improve it/what went wrong. Science rarely goes how you want it to. Fantastic job Cody!

Cody: "I'm growing grass in my house" police: "He's doing what!"

3:30 "Why are you playing with litter, human?" A+ oversight by your supervisor there.

I never thought I'd be hyped for grass growing in carbon sponge-enhanced dirt, but here I am looking forward to to it

Buddy in the middle of the night whispers into a sleeping Cody’s ear: Mor grass gud.

Very interesting ! Looking forward for an update

Shocked to see Cody without a beard.....Immediately went back to see if I missed any prior videos.

Experiment is great. Filling in the gaps where others haven't. I also like the black background, it is very clean and not distracting while you're giving your explanation.

ok but why is beardless cody so handsome can someone explain

You are very clever to have realized the chlorine exposure. That is a very small piece of the puzzle but had an apparently massive impact. Nice one Cody!

This is the kind of cool stuff I enjoy seeing get documented

**Beardless Cody doesn't exist, he can't hurt you.** Beardless Cody:

Cody is becoming KZfaq's dad and I'm so proud of him

Someone: “...It’s like watching grass grow...” Cody: watching grass grow...hmmmm me: Yesssssss

I love your dedication to doing science correctly and showing people that science is messy and is often worked on and fine tuned over time. People weren't just making up the laws of nature, we stand on the backs of giants.

Everyone during a pandemic: grows long hair, a scruffy beard, showers once a week, eats junk-food daily, exercises never. Cody during a pandemic: smoother than ever.

"the cat supervised the whole process" and my cat was fascinated by your supervisor :D

The cat's like: I happen to be an expert at putting lumps in sand. :)

I've always appreciated how Cody doesn't care about the duration of his experiments but, rather yielding accurate results.

Try using rainwater. During winter, melt snow. Makes sense because when you put the charcoal in the ground, that will be the water source, and the bacteria will be used to it.

Charcoal in aquarium filters concentrate nitrogen and bacteria, I always used it to make a layer in pots to every plant I wanted to grow up to the stage to plant into the definitive place. Some species of plants profited a lot from this, mostly those that are found in wetlands. By the way, this was my goal, finding ways to regrow wetlands to obtain clean water sources in damaged landscapes. Nitrogen is key, grass roots create the filtering and infiltration system to wet the soil. Some grasses are incredible efficient in doing this, the roots reach several feet under the ground. There are experiments that show this, creating wetlands on very low precipitation regions. Charcoal may help with this, mostly by retaining water by its porosity, and offering a moist environment for some bacteria and other organisms.

50k people came here to watch grass grow. :) That's how you know you're making good content. :)

Cody: "I've been obsessed with (eating) charcoal for some time now" - fixed it for you

Wow, an experiment on KZfaq that includes a "threats to validity" section! This is a great science video, probably even better than if you hadn't used the chlorinated water.

CODY! I was on Snapchat watching “what if” and they’re doing a special on dry ice and you were on it! In the clip you did chewing on dry ice! It was crazy! I just had to make it known to the world :)

Root aeration might play a role too. When I pot my plants I make sure to keep the particle size high so that the roots can breathe and the water drains through quickly. Thanks for the great video Cody!

3:55 Buddy: *slaps roof of soil containers* "These bad boys can fit so many turds in them."

Alternative title: Experiment to determine if size does matter after all

I love these kinds of experiments involving plants and soil!

I love two things in life: novel scientific experiments that add knowledge to the world, and safe, happy, comfortable cats.

Cody's age ranges wildly between videos--he obviously has invented time travel.

Like the newly-groomed look, but would rather have had Buddy present it, as implied by the thumbnail! When you get bored with doing this with grass, try catnip!

I love videos like this because it helps you with your projects but also has a greater use for even average people like myself. I only have a little veggie garden in my yard but knowing what size bio char could be really helpful if I wanted to really get serious about it.

This, right here, is my favorite style of video you make. Serious business science. To see your integrity throughout the process, determining and admitting control and experimental flaws is amazing, and seeing the actual data is beyond fascinating. Please, PLEASE keep these sorts of videos going. I will be here for every single one.

Hey Cody, I've been assisting a professor of mine who specializes in freshwater systems. It might be good to set up a filter system that makes Deionized water, this type of filter takes out minerals in the water including chlorine. In lab we -are- were (thanks covid) we would use deionized water to test for tannin concentrations leached from different leave species, any chemical interference in tap water could have an effect on our readings. Deionized water is expensive to purchase but deionizeation filters can be built and I have no doubt that you would be able to build one. Another suggestion that I have is that you may need test multiple plant types, if you only use one species of plant you may only be getting data on what biochar size is best for that species. I know you said that you were going to do that but I just wanted to encourage you to test with multiple species. You may want to select plant species with varying root structures or nutrient requirements. It made me so happy to see this video and how well you showed the scientific method, I look forward to future videos on this and other topics.

You also may have washed away nutrients that was stuck to the charcoal

separate your char into different sizes, then "activate" it with either, wormcast or seaweed extract or the many other options. also have one/s with "inactivate" char too, see how they fair.

Your new glasses look good!

Buddy is Science Cat. This I declare.

Fairly good experimental design and good analysis of the results. I would suggest running the experiment in triplicate; three buckets per granule size. While this significantly increases the amount needed, it tells you how much variance there is in your data and how confident you can be in your results. Great video and I look forward to seeing the next!

Really nice planning and analyzing with a good conclusion and error estimation! Looking forward for the next version with improved conditions.

Only Cody is willing to spend his time _watching_ _the_ _grass_ _grow_ for science!

Ah yes, I needed some of Cody’s lab today

Let's take a moment to appreciate the fact that in the last 6-7 years the quirkiness and formula of cody's video hasn't changed . We're closing in on the end of the cursed year that was 2020 and the only thing that has changed over time was the quality of the videos which progressively improved throughout the years. I'm not american so I don't celebrate thanksgiving and I might be a little late but I think I speak for everyone when I say that we're grateful for your channel cody , we truly do appreciate everything you do around here.

Speaking as a North-ish European.... your "soil" looks a hell of a lot like "sand" to us.

Perhaps the trend for particle size could be related to how much stored GoodPlantStuff™ stays within the pieces after being washed, not necessarily just the chlorination

Learned a while ago on a commercial ice machine, tap water+charcoal filter=stuff growing in the ice bin.

This really cool that you're looking into this! It is something that you and the viewers can always look forward to, similar to the mushroom saga! I'd say this was a great first step and you really ironed out some of the factors to make the experiment easier going forward! As always, go at a pace that works best for you, and we will always be here along for the ride. Happy holidays.

I don´t usually comment a lot but i gotta say this : Even if it´s just seeing you grow some plain old grass i can not help but genuinely enjoy your videos. Thanks for doing what you do, i wish you all the best! Greetings from Germany

I expected to see a timelapse of grass growing at the end but instead saw the bobcat enjoying grass. not really disappointed.

buddy: hey this black stuff smells kinda like fish, can i eat it?

I really like that I can always trust Cody's content to be good science and never any bullcrap click bait,thank you Cody for being real

Cody is trying to answer the age-old question... "Does size matter?"

Damn dude, a shave and a haircut* and you look like a respectable gentleman! 😄 (*2 bits)

I am extremely interested in how you plan to produce and distribute such a vast quantity of charcoal. sounds awesome!

The best codys lab video I´ve seen in a long long time. Seems like you are doing much better now.

Only youtuber I actively try to like every video I watch. You're a great dude.

as with any good experiment it needs to be secured against interference from the cat. great video!

K, so. Who are you and where's Cody? Jk man, you look healthier in this video than over that past year or so. Healthy Cody is Happy Cody!

This is your best video in a while, I love experiments!! Great work :)

Cody that's some damn good analysis, I like that you acknowledged errors in your experiment and then drew new conclusions from it. That's hubris free science. A+ would love to see more of this. As an aside I have also recently made a mistake with chlorine in my science experiment. I know youre familiar with aquaponics, something I used to have just to power the growth of a lonely store bought avacado plant... but that fish eventually died from manufactured parts failing. Rather than let the plant die too I decided to change experiments and basically "water compost" (adding random spare cuts from fruits and veggies and balancing ph by adding crushed egg shells) in a sub tank separate from the grow bed and sump tank. Now I had been adding water to this tank that I thought had been offgassing chlorine so that it was basically "pure." Turns out some water municipalities have been adding chloramine to some water sources and not just plain chlorine, which depends on region. The chloramine lasts a whole lot longer and isn't offgassing the same way that chlorine does. My plant had been suffering without me realizing. Anyway my science suggestion for a future video would be to compare the effects (much the same as this video) between chlorine water, chloramine water, stychiometrically "perfect" water, and some random blend of WATER that you think might work well on plant growth like grass or beans or something.

Is it chlorine related or that you washed out more nutrients with water? Also maybe the finer particles wash out the good stuff easier than bigger chunks?

Watering plants with rain water vs tap water would be an interesting experiment

This is a fantastic video, I'm in love. The closing thoughts and revision were golden

I love this topic! As a gardener I use biochar in my garden all the time and charge it with compost tea.

The way you explained this video seemed like you were ready a scholarly article. You should publish.

I'm tired and I read this as "the effects of bipolar disorder on plant growth"

Been waiting for you to test Biochar for years. happpy now :D

Your videos has had a boost in quality lately! Very happy about that! Also. Lookin fresh!

Cody plans to bury several tons of charcoal on his land. Future archeologists will be so pumped when they find the site of CHB and can perfectly carbon date Cody's life.

... I literally just watched a video of grass growing. Congrats, Cody. You've ruined me. XD

I like the new shaved and refined look of Cody. And I appreciate he started making videos again . Thank you Cody. I want to see you on the first ship to Mars. :)

I'm glad you kept the project going, even after kitty helped mow the grass!

The thumbnail poses the question "which bucket is the closest grey to my cat?"

Hi ya Cody, you should have weighed with full roots too. Root production is more important as well at that point in it's life. Start using RO water as well.

Cody, grow your goatee back man, 2021 calls for it!

When I was in college I did research in the plant biology department on the effect of different size carbon fullerene particles on the growth of tomato plants, specifically their effect on the uptake and respiration of water. It was super interesting and this project reminds me of that!!

first thing i thought when he washed the charcoal: "noooooo! thats tapwater, it has chlorine!" :)

Great experiment idea, can't wait for the results of your second attempt! Out of curiosity, what species of grass did you use?

The best experiments produce results you don't expect. You learned so much.

i appreciate getting to see your thought process and planning for the next experiment. thanks for sharing that in the video as well. best part of your vids .

Soil level in the containers will effect how much of the grass gets cut. Larger particals could make the soil level higher.

"the cat really likes grass" yea no kidding, very odd that he likes it so much.

Love the new video style. Very professional. Great scientific experimentation!

Love this video. Great to know.its good to know a small grassroots effort on your part to take care of your land and others.

Thought! Take some of your biochar and do bacterial growth tests on exposed to city water vs not.

Good pilot study. Do you intend to grow more than just grass in the ground when you eventually put this all into action? Different plants may respond differently to different particle size based on how their roots work and what kind of soil density/porosity they prefer. Might be worth considering testing two different species of plant

Hey Cody! Cool video, I thoroughly enjoyed it. You're looking great btw.

So pleased your looking happy and healthy again!! Back to good old cody!!!

While the theory of chlorinated water is heartbreaking, I think it's also a fantastic discovery! Not the expected outcome, but one that I think is really important.

Have you thought of either presenting the data/info to a professor or someone else in a relevant field of study or formally writing up all this stuff you've found with charcoal / biochar and trying to publish it?

This is one of my favorite videos. This is the kind I like. Although the experiments may no seem as rigurous as possible, they are evidence of how the scientific method progresses

what an upgrade this channel has done over the years.. love this stuff cody big thanks for your insight

Thx, after this I'd be more interested in soil to coal ratio, figure coal-size might be negiable after the clorine issue is resolved